Physics-
General
Easy

Question

A ball of mass 1kg strikes a heavy platform, elastically, moving upwards with a velocity of 5m/s. The speed of the ball just before the collision is 10m/s downwards. Then the impulse imparted by the platform on the ball is

  1. 15 N – s    
  2. 10 N – s    
  3. 20 N – s    
  4. 30 N – s    

The correct answer is: 15 N – s

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