Physics-
General
Easy

Question

A ball of mass m falls vertically from a height h and collides with a block of equal mass m moving horizontally with a velocity v on a surface. The coefficient of kinetic friction between the block and the surface is 0.2, while the coefficient of restitution e between the ball and the block is 0.5. There is no friction acting between the ball and the block. The velocity of the block decreases by

  1. 0    
  2. 0.1 square root of 2 g h end root    
  3. 0.3 square root of 2 g h end root    
  4. can’t be said    

The correct answer is: can’t be said

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