04. Motion Under Gravity
Motion in One Dimensions

141856 A person throws balls into air vertically upward in regular intervals of time of one second. The next ball is thrown when the velocity of the ball thrown earlier becomes zero. The height to which the balls rise is :
(Assume, \(\mathrm{g}=10 \mathrm{~ms}^{-2}\) )

1 \(20 \mathrm{~m}\)
2 \(5 \mathrm{~m}\)
3 \(10 \mathrm{~m}\)
4 \(7.5 \mathrm{~m}\)
Motion in One Dimensions

141860 A body is released from a great height falls freely towards the earth. Another body is released from the same height exactly a second later. Then the separation between two bodies, \(\mathbf{2}\) sec after the release of the second body is nearly

1 \(15 \mathrm{~m}\)
2 \(20 \mathrm{~m}\)
3 \(25 \mathrm{~m}\)
4 \(30 \mathrm{~m}\)
Motion in One Dimensions

141862 A ball released at rest from the top of a tower reaches the ground in \(4 \mathrm{~s}\). The height of the ball from the ground at \(t=2 s\) of its journey is

1 \(60 \mathrm{~m}\)
2 \(40 \mathrm{~m}\)
3 \(20 \mathrm{~m}\)
4 \(15 \mathrm{~m}\)
Motion in One Dimensions

141863 A ball is dropped from the top of \(80 \mathrm{~m}\) high tower. If after \(\mathbf{2}\) sec of fall the gravity \((\mathrm{g}=\mathbf{1 0}\) \(\mathrm{m} / \mathrm{s}^{2}\) ) disappears, then time taken to reach ground since the gravity disappeared is

1 \(2 \mathrm{sec}\)
2 \(3 \mathrm{sec}\)
3 \(4 \mathrm{sec}\)
4 \(5 \mathrm{sec}\)
Motion in One Dimensions

141856 A person throws balls into air vertically upward in regular intervals of time of one second. The next ball is thrown when the velocity of the ball thrown earlier becomes zero. The height to which the balls rise is :
(Assume, \(\mathrm{g}=10 \mathrm{~ms}^{-2}\) )

1 \(20 \mathrm{~m}\)
2 \(5 \mathrm{~m}\)
3 \(10 \mathrm{~m}\)
4 \(7.5 \mathrm{~m}\)
Motion in One Dimensions

141860 A body is released from a great height falls freely towards the earth. Another body is released from the same height exactly a second later. Then the separation between two bodies, \(\mathbf{2}\) sec after the release of the second body is nearly

1 \(15 \mathrm{~m}\)
2 \(20 \mathrm{~m}\)
3 \(25 \mathrm{~m}\)
4 \(30 \mathrm{~m}\)
Motion in One Dimensions

141862 A ball released at rest from the top of a tower reaches the ground in \(4 \mathrm{~s}\). The height of the ball from the ground at \(t=2 s\) of its journey is

1 \(60 \mathrm{~m}\)
2 \(40 \mathrm{~m}\)
3 \(20 \mathrm{~m}\)
4 \(15 \mathrm{~m}\)
Motion in One Dimensions

141863 A ball is dropped from the top of \(80 \mathrm{~m}\) high tower. If after \(\mathbf{2}\) sec of fall the gravity \((\mathrm{g}=\mathbf{1 0}\) \(\mathrm{m} / \mathrm{s}^{2}\) ) disappears, then time taken to reach ground since the gravity disappeared is

1 \(2 \mathrm{sec}\)
2 \(3 \mathrm{sec}\)
3 \(4 \mathrm{sec}\)
4 \(5 \mathrm{sec}\)
Motion in One Dimensions

141856 A person throws balls into air vertically upward in regular intervals of time of one second. The next ball is thrown when the velocity of the ball thrown earlier becomes zero. The height to which the balls rise is :
(Assume, \(\mathrm{g}=10 \mathrm{~ms}^{-2}\) )

1 \(20 \mathrm{~m}\)
2 \(5 \mathrm{~m}\)
3 \(10 \mathrm{~m}\)
4 \(7.5 \mathrm{~m}\)
Motion in One Dimensions

141860 A body is released from a great height falls freely towards the earth. Another body is released from the same height exactly a second later. Then the separation between two bodies, \(\mathbf{2}\) sec after the release of the second body is nearly

1 \(15 \mathrm{~m}\)
2 \(20 \mathrm{~m}\)
3 \(25 \mathrm{~m}\)
4 \(30 \mathrm{~m}\)
Motion in One Dimensions

141862 A ball released at rest from the top of a tower reaches the ground in \(4 \mathrm{~s}\). The height of the ball from the ground at \(t=2 s\) of its journey is

1 \(60 \mathrm{~m}\)
2 \(40 \mathrm{~m}\)
3 \(20 \mathrm{~m}\)
4 \(15 \mathrm{~m}\)
Motion in One Dimensions

141863 A ball is dropped from the top of \(80 \mathrm{~m}\) high tower. If after \(\mathbf{2}\) sec of fall the gravity \((\mathrm{g}=\mathbf{1 0}\) \(\mathrm{m} / \mathrm{s}^{2}\) ) disappears, then time taken to reach ground since the gravity disappeared is

1 \(2 \mathrm{sec}\)
2 \(3 \mathrm{sec}\)
3 \(4 \mathrm{sec}\)
4 \(5 \mathrm{sec}\)
Motion in One Dimensions

141856 A person throws balls into air vertically upward in regular intervals of time of one second. The next ball is thrown when the velocity of the ball thrown earlier becomes zero. The height to which the balls rise is :
(Assume, \(\mathrm{g}=10 \mathrm{~ms}^{-2}\) )

1 \(20 \mathrm{~m}\)
2 \(5 \mathrm{~m}\)
3 \(10 \mathrm{~m}\)
4 \(7.5 \mathrm{~m}\)
Motion in One Dimensions

141860 A body is released from a great height falls freely towards the earth. Another body is released from the same height exactly a second later. Then the separation between two bodies, \(\mathbf{2}\) sec after the release of the second body is nearly

1 \(15 \mathrm{~m}\)
2 \(20 \mathrm{~m}\)
3 \(25 \mathrm{~m}\)
4 \(30 \mathrm{~m}\)
Motion in One Dimensions

141862 A ball released at rest from the top of a tower reaches the ground in \(4 \mathrm{~s}\). The height of the ball from the ground at \(t=2 s\) of its journey is

1 \(60 \mathrm{~m}\)
2 \(40 \mathrm{~m}\)
3 \(20 \mathrm{~m}\)
4 \(15 \mathrm{~m}\)
Motion in One Dimensions

141863 A ball is dropped from the top of \(80 \mathrm{~m}\) high tower. If after \(\mathbf{2}\) sec of fall the gravity \((\mathrm{g}=\mathbf{1 0}\) \(\mathrm{m} / \mathrm{s}^{2}\) ) disappears, then time taken to reach ground since the gravity disappeared is

1 \(2 \mathrm{sec}\)
2 \(3 \mathrm{sec}\)
3 \(4 \mathrm{sec}\)
4 \(5 \mathrm{sec}\)