# The first ball of mass moving with a velocity collides head on with the second ball of mass at rest. If the coefficient of restitution is ,then the ratio of  the velocities of the first and the second ball after the collision is a) b) c) d) ## Question ID - 100330 :- The first ball of mass moving with a velocity collides head on with the second ball of mass at rest. If the coefficient of restitution is ,then the ratio of  the velocities of the first and the second ball after the collision is a) b) c) d) 3537

 (a) As the collision is head-on, or (i) Further, coefficient of restitution is Or (ii) Adding Eqs. (i) and (ii), we get (iii) Now (iv) (v) (vi)

Next Question :

A cylinder of height and diameter is kept on a frictional turntable as shown in Figure. The axis of the cylinder is perpendicular to the surface of the table and the distance of axis of the cylinder is from the centre of the table. The angular speed of the turntable at which the cylinder will start toppling (assume that friction is sufficient to prevent slipping) is a) b) c) d)  