149705 Three circular discs of same material and same thickness of radii \(r, 2 r\) and \(3 r\) are placed on a horizontal plane such that their centres lie along a straight line. The radius of the middle disc is \(2 r\) and it touches the other two discs. The distance of the centre of mass of the system from the centre of the smaller disc is
149706 Two blocks of masses \(10 \mathrm{~kg}\) and \(2 \mathrm{Kg}\) are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of \(12 \mathrm{~ms}^{-1}\) to the heavier block in the direction of the lighter block. The velocity of centre of mass is:
149705 Three circular discs of same material and same thickness of radii \(r, 2 r\) and \(3 r\) are placed on a horizontal plane such that their centres lie along a straight line. The radius of the middle disc is \(2 r\) and it touches the other two discs. The distance of the centre of mass of the system from the centre of the smaller disc is
149706 Two blocks of masses \(10 \mathrm{~kg}\) and \(2 \mathrm{Kg}\) are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of \(12 \mathrm{~ms}^{-1}\) to the heavier block in the direction of the lighter block. The velocity of centre of mass is:
149705 Three circular discs of same material and same thickness of radii \(r, 2 r\) and \(3 r\) are placed on a horizontal plane such that their centres lie along a straight line. The radius of the middle disc is \(2 r\) and it touches the other two discs. The distance of the centre of mass of the system from the centre of the smaller disc is
149706 Two blocks of masses \(10 \mathrm{~kg}\) and \(2 \mathrm{Kg}\) are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of \(12 \mathrm{~ms}^{-1}\) to the heavier block in the direction of the lighter block. The velocity of centre of mass is:
149705 Three circular discs of same material and same thickness of radii \(r, 2 r\) and \(3 r\) are placed on a horizontal plane such that their centres lie along a straight line. The radius of the middle disc is \(2 r\) and it touches the other two discs. The distance of the centre of mass of the system from the centre of the smaller disc is
149706 Two blocks of masses \(10 \mathrm{~kg}\) and \(2 \mathrm{Kg}\) are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of \(12 \mathrm{~ms}^{-1}\) to the heavier block in the direction of the lighter block. The velocity of centre of mass is: