RELATIVE VELOCITY
MOTION IN A STRIGHT LINE

269698 A small body isdropped from a rising balloon. A person A stands on ground, while another person B is on the balloon. Choosethe correct statement: Immediately, after the body is released.

1 \(A\) and \(B\), both feel that the body is coming (going) down.
2 \(A\) and \(B\), bothfeel that body iscoming up.
3 A fels that the body is coming down, whileB feds that thebody is going up
4 A feds that the body isgoing up, whileB feds that thebody is going down.
MOTION IN A STRIGHT LINE

269699 Seeta is moving due east with a velocity of \(v_{1} \mathrm{~m} / \mathrm{s}\) and \(G\) eeta is moving due west with a velocity of \(\mathrm{v}_{2} \mathrm{~m} / \mathrm{s}\). Thevelocity of Seeta with respect to \(G\) eeta is

1 \(v_{1}+v_{2}\) dueeast
2 \(v_{1}-v_{2}\) dueeast
3 \(v_{1}-v_{2}\) duewest
4 \(v_{1}+v_{2}\) duewest
MOTION IN A STRIGHT LINE

269717 A ball is dropped from a building of height\(45 \mathrm{~m}\). Simultaneously another ball is thrown up with a speed \(40 \mathrm{~m} / \mathrm{s}\). The rate of change of relative speed of the balls is

1 \(20 \mathrm{ma}^{-1}\)
2 \(40 \mathrm{~ms}^{-1}\)
3 \(30 \mathrm{~ms}^{-1}\)
4 \(0 \mathrm{~ms}^{-1}\)
MOTION IN A STRIGHT LINE

269718 Two cars 1 \& 2 starting from rest are moving with speeds\(v_{1}\) and \(v_{2} m / s\left(v_{1}\lt v_{2}\right)\). C ar 2 is ahead of car ' 1 ' by \(s\) meter when the driver of the car ' 1 ' sees car ' 2 '. What minimum retardation should begiven to car ' 1 ' to avoid collision.
(2002A)

1 \(\frac{v_{1}-V_{2}}{s}\)
2 \(\frac{v_{1}+v_{2}}{s}\)
3 \(\frac{\left(v_{1}+v_{2}\right)^{2}}{2 s}\)
4 \(\frac{\left(v_{1}-v_{2}\right)^{2}}{2 s}\)
MOTION IN A STRIGHT LINE

269719 Two cars are travelling towards each other on a straight road at velocities\(15 \mathrm{~m} / \mathrm{s}\) and 16 \(\mathrm{m} / \mathrm{s}\) respectively. When they are \(150 \mathrm{~m}\) apart, both thedriversapply the brakesand the cars decelerateat \(3 \mathrm{~m} / \mathrm{s}^{2}\) and \(4 \mathrm{~m} / \mathrm{s}^{2}\) until they stop. Separation between thecars when they come to rest is

1 \(86.5 \mathrm{~m}\)
2 \(89.5 \mathrm{~m}\)
3 \(85.5 \mathrm{~m}\)
4 \(80.5 \mathrm{~m}\)
MOTION IN A STRIGHT LINE

269698 A small body isdropped from a rising balloon. A person A stands on ground, while another person B is on the balloon. Choosethe correct statement: Immediately, after the body is released.

1 \(A\) and \(B\), both feel that the body is coming (going) down.
2 \(A\) and \(B\), bothfeel that body iscoming up.
3 A fels that the body is coming down, whileB feds that thebody is going up
4 A feds that the body isgoing up, whileB feds that thebody is going down.
MOTION IN A STRIGHT LINE

269699 Seeta is moving due east with a velocity of \(v_{1} \mathrm{~m} / \mathrm{s}\) and \(G\) eeta is moving due west with a velocity of \(\mathrm{v}_{2} \mathrm{~m} / \mathrm{s}\). Thevelocity of Seeta with respect to \(G\) eeta is

1 \(v_{1}+v_{2}\) dueeast
2 \(v_{1}-v_{2}\) dueeast
3 \(v_{1}-v_{2}\) duewest
4 \(v_{1}+v_{2}\) duewest
MOTION IN A STRIGHT LINE

269717 A ball is dropped from a building of height\(45 \mathrm{~m}\). Simultaneously another ball is thrown up with a speed \(40 \mathrm{~m} / \mathrm{s}\). The rate of change of relative speed of the balls is

1 \(20 \mathrm{ma}^{-1}\)
2 \(40 \mathrm{~ms}^{-1}\)
3 \(30 \mathrm{~ms}^{-1}\)
4 \(0 \mathrm{~ms}^{-1}\)
MOTION IN A STRIGHT LINE

269718 Two cars 1 \& 2 starting from rest are moving with speeds\(v_{1}\) and \(v_{2} m / s\left(v_{1}\lt v_{2}\right)\). C ar 2 is ahead of car ' 1 ' by \(s\) meter when the driver of the car ' 1 ' sees car ' 2 '. What minimum retardation should begiven to car ' 1 ' to avoid collision.
(2002A)

1 \(\frac{v_{1}-V_{2}}{s}\)
2 \(\frac{v_{1}+v_{2}}{s}\)
3 \(\frac{\left(v_{1}+v_{2}\right)^{2}}{2 s}\)
4 \(\frac{\left(v_{1}-v_{2}\right)^{2}}{2 s}\)
MOTION IN A STRIGHT LINE

269719 Two cars are travelling towards each other on a straight road at velocities\(15 \mathrm{~m} / \mathrm{s}\) and 16 \(\mathrm{m} / \mathrm{s}\) respectively. When they are \(150 \mathrm{~m}\) apart, both thedriversapply the brakesand the cars decelerateat \(3 \mathrm{~m} / \mathrm{s}^{2}\) and \(4 \mathrm{~m} / \mathrm{s}^{2}\) until they stop. Separation between thecars when they come to rest is

1 \(86.5 \mathrm{~m}\)
2 \(89.5 \mathrm{~m}\)
3 \(85.5 \mathrm{~m}\)
4 \(80.5 \mathrm{~m}\)
MOTION IN A STRIGHT LINE

269698 A small body isdropped from a rising balloon. A person A stands on ground, while another person B is on the balloon. Choosethe correct statement: Immediately, after the body is released.

1 \(A\) and \(B\), both feel that the body is coming (going) down.
2 \(A\) and \(B\), bothfeel that body iscoming up.
3 A fels that the body is coming down, whileB feds that thebody is going up
4 A feds that the body isgoing up, whileB feds that thebody is going down.
MOTION IN A STRIGHT LINE

269699 Seeta is moving due east with a velocity of \(v_{1} \mathrm{~m} / \mathrm{s}\) and \(G\) eeta is moving due west with a velocity of \(\mathrm{v}_{2} \mathrm{~m} / \mathrm{s}\). Thevelocity of Seeta with respect to \(G\) eeta is

1 \(v_{1}+v_{2}\) dueeast
2 \(v_{1}-v_{2}\) dueeast
3 \(v_{1}-v_{2}\) duewest
4 \(v_{1}+v_{2}\) duewest
MOTION IN A STRIGHT LINE

269717 A ball is dropped from a building of height\(45 \mathrm{~m}\). Simultaneously another ball is thrown up with a speed \(40 \mathrm{~m} / \mathrm{s}\). The rate of change of relative speed of the balls is

1 \(20 \mathrm{ma}^{-1}\)
2 \(40 \mathrm{~ms}^{-1}\)
3 \(30 \mathrm{~ms}^{-1}\)
4 \(0 \mathrm{~ms}^{-1}\)
MOTION IN A STRIGHT LINE

269718 Two cars 1 \& 2 starting from rest are moving with speeds\(v_{1}\) and \(v_{2} m / s\left(v_{1}\lt v_{2}\right)\). C ar 2 is ahead of car ' 1 ' by \(s\) meter when the driver of the car ' 1 ' sees car ' 2 '. What minimum retardation should begiven to car ' 1 ' to avoid collision.
(2002A)

1 \(\frac{v_{1}-V_{2}}{s}\)
2 \(\frac{v_{1}+v_{2}}{s}\)
3 \(\frac{\left(v_{1}+v_{2}\right)^{2}}{2 s}\)
4 \(\frac{\left(v_{1}-v_{2}\right)^{2}}{2 s}\)
MOTION IN A STRIGHT LINE

269719 Two cars are travelling towards each other on a straight road at velocities\(15 \mathrm{~m} / \mathrm{s}\) and 16 \(\mathrm{m} / \mathrm{s}\) respectively. When they are \(150 \mathrm{~m}\) apart, both thedriversapply the brakesand the cars decelerateat \(3 \mathrm{~m} / \mathrm{s}^{2}\) and \(4 \mathrm{~m} / \mathrm{s}^{2}\) until they stop. Separation between thecars when they come to rest is

1 \(86.5 \mathrm{~m}\)
2 \(89.5 \mathrm{~m}\)
3 \(85.5 \mathrm{~m}\)
4 \(80.5 \mathrm{~m}\)
MOTION IN A STRIGHT LINE

269698 A small body isdropped from a rising balloon. A person A stands on ground, while another person B is on the balloon. Choosethe correct statement: Immediately, after the body is released.

1 \(A\) and \(B\), both feel that the body is coming (going) down.
2 \(A\) and \(B\), bothfeel that body iscoming up.
3 A fels that the body is coming down, whileB feds that thebody is going up
4 A feds that the body isgoing up, whileB feds that thebody is going down.
MOTION IN A STRIGHT LINE

269699 Seeta is moving due east with a velocity of \(v_{1} \mathrm{~m} / \mathrm{s}\) and \(G\) eeta is moving due west with a velocity of \(\mathrm{v}_{2} \mathrm{~m} / \mathrm{s}\). Thevelocity of Seeta with respect to \(G\) eeta is

1 \(v_{1}+v_{2}\) dueeast
2 \(v_{1}-v_{2}\) dueeast
3 \(v_{1}-v_{2}\) duewest
4 \(v_{1}+v_{2}\) duewest
MOTION IN A STRIGHT LINE

269717 A ball is dropped from a building of height\(45 \mathrm{~m}\). Simultaneously another ball is thrown up with a speed \(40 \mathrm{~m} / \mathrm{s}\). The rate of change of relative speed of the balls is

1 \(20 \mathrm{ma}^{-1}\)
2 \(40 \mathrm{~ms}^{-1}\)
3 \(30 \mathrm{~ms}^{-1}\)
4 \(0 \mathrm{~ms}^{-1}\)
MOTION IN A STRIGHT LINE

269718 Two cars 1 \& 2 starting from rest are moving with speeds\(v_{1}\) and \(v_{2} m / s\left(v_{1}\lt v_{2}\right)\). C ar 2 is ahead of car ' 1 ' by \(s\) meter when the driver of the car ' 1 ' sees car ' 2 '. What minimum retardation should begiven to car ' 1 ' to avoid collision.
(2002A)

1 \(\frac{v_{1}-V_{2}}{s}\)
2 \(\frac{v_{1}+v_{2}}{s}\)
3 \(\frac{\left(v_{1}+v_{2}\right)^{2}}{2 s}\)
4 \(\frac{\left(v_{1}-v_{2}\right)^{2}}{2 s}\)
MOTION IN A STRIGHT LINE

269719 Two cars are travelling towards each other on a straight road at velocities\(15 \mathrm{~m} / \mathrm{s}\) and 16 \(\mathrm{m} / \mathrm{s}\) respectively. When they are \(150 \mathrm{~m}\) apart, both thedriversapply the brakesand the cars decelerateat \(3 \mathrm{~m} / \mathrm{s}^{2}\) and \(4 \mathrm{~m} / \mathrm{s}^{2}\) until they stop. Separation between thecars when they come to rest is

1 \(86.5 \mathrm{~m}\)
2 \(89.5 \mathrm{~m}\)
3 \(85.5 \mathrm{~m}\)
4 \(80.5 \mathrm{~m}\)
MOTION IN A STRIGHT LINE

269698 A small body isdropped from a rising balloon. A person A stands on ground, while another person B is on the balloon. Choosethe correct statement: Immediately, after the body is released.

1 \(A\) and \(B\), both feel that the body is coming (going) down.
2 \(A\) and \(B\), bothfeel that body iscoming up.
3 A fels that the body is coming down, whileB feds that thebody is going up
4 A feds that the body isgoing up, whileB feds that thebody is going down.
MOTION IN A STRIGHT LINE

269699 Seeta is moving due east with a velocity of \(v_{1} \mathrm{~m} / \mathrm{s}\) and \(G\) eeta is moving due west with a velocity of \(\mathrm{v}_{2} \mathrm{~m} / \mathrm{s}\). Thevelocity of Seeta with respect to \(G\) eeta is

1 \(v_{1}+v_{2}\) dueeast
2 \(v_{1}-v_{2}\) dueeast
3 \(v_{1}-v_{2}\) duewest
4 \(v_{1}+v_{2}\) duewest
MOTION IN A STRIGHT LINE

269717 A ball is dropped from a building of height\(45 \mathrm{~m}\). Simultaneously another ball is thrown up with a speed \(40 \mathrm{~m} / \mathrm{s}\). The rate of change of relative speed of the balls is

1 \(20 \mathrm{ma}^{-1}\)
2 \(40 \mathrm{~ms}^{-1}\)
3 \(30 \mathrm{~ms}^{-1}\)
4 \(0 \mathrm{~ms}^{-1}\)
MOTION IN A STRIGHT LINE

269718 Two cars 1 \& 2 starting from rest are moving with speeds\(v_{1}\) and \(v_{2} m / s\left(v_{1}\lt v_{2}\right)\). C ar 2 is ahead of car ' 1 ' by \(s\) meter when the driver of the car ' 1 ' sees car ' 2 '. What minimum retardation should begiven to car ' 1 ' to avoid collision.
(2002A)

1 \(\frac{v_{1}-V_{2}}{s}\)
2 \(\frac{v_{1}+v_{2}}{s}\)
3 \(\frac{\left(v_{1}+v_{2}\right)^{2}}{2 s}\)
4 \(\frac{\left(v_{1}-v_{2}\right)^{2}}{2 s}\)
MOTION IN A STRIGHT LINE

269719 Two cars are travelling towards each other on a straight road at velocities\(15 \mathrm{~m} / \mathrm{s}\) and 16 \(\mathrm{m} / \mathrm{s}\) respectively. When they are \(150 \mathrm{~m}\) apart, both thedriversapply the brakesand the cars decelerateat \(3 \mathrm{~m} / \mathrm{s}^{2}\) and \(4 \mathrm{~m} / \mathrm{s}^{2}\) until they stop. Separation between thecars when they come to rest is

1 \(86.5 \mathrm{~m}\)
2 \(89.5 \mathrm{~m}\)
3 \(85.5 \mathrm{~m}\)
4 \(80.5 \mathrm{~m}\)