# A ball of mass is released from rest relative to elevator at a height above the floor of the elevator. After making collision with the floor of the elevator it rebounces to height The coefficient of restitution for collision is For this situation, mark the correct statement(s) a) If elevator is moving down with constant velocity then b) If elevator is moving down with constant velocity , then c) If elevator is moving down with constant velocity then impulse imparted by floor of the elevator to the ball is in the upward direction d) If elevator is moving with constant acceleration of g/4 in upward direction, then it is not possible to determine a relation between and from the given information

## Question ID - 100309 :- A ball of mass is released from rest relative to elevator at a height above the floor of the elevator. After making collision with the floor of the elevator it rebounces to height The coefficient of restitution for collision is For this situation, mark the correct statement(s) a) If elevator is moving down with constant velocity then b) If elevator is moving down with constant velocity , then c) If elevator is moving down with constant velocity then impulse imparted by floor of the elevator to the ball is in the upward direction d) If elevator is moving with constant acceleration of g/4 in upward direction, then it is not possible to determine a relation between and from the given information

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 (a) As coefficient of restitution equation is valid in all frames of reference, so in the frame of lift  Impulse delivered by the elevator to ball is If the elevator is accelerating, then replacing gwith g +g/4 we get Next Question :

A solid sphere of mass is lying at rest on a rough horizontal surface. The coefficient of friction between the ground and sphere is The maximum value of so that the sphere will not slip, is equal to a) b) c) d)  