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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
- 15 N – s
- 10 N – s
- 20 N – s
- 30 N – s
The correct answer is: 15 N – s
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