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Laws of Motion
Question
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Two billiard balls each of mass 50 g moving in opposite directions with a speed of 36 km/hr collide and rebound with the same velocity. What is the impulse imparted to each ball due to the other. 

Answer

Impulse imparted to each ball = change in momentum of each ball. 
                                       = 2 mv
                                       = 2 x (50 x 10-3) x 10
                                       = 1 kg m/s

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