# 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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Answer Key : (a) -
 (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

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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)

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