1. 1. Two billiard balls each of mass 0.15kg are moving towards each other with a velocity of 3m/s E and 4m/s W. After the collision the ball with initial velocity of 3m/s keeps moving E with a speed of 2.5m/s. what is the final velocity of the other car? 
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3. 2. Describe briefly:
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5. a. How momentum is conserved in explosions? 
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7. b. Which Newton's laws of motion relates to law of conservation of Momentum?