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Physics: Momentum and Collision

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1. If a forward momentum of a bullet is the same as the backward momentum of the gun, why isn't it as dangerous to be hit by the gun as by the bullet?

2. Two balls are thrown at a concrete wall. both balls have the same mass and the same velocity. One ball is perfectly inelastic and stays on the wall after collision and the second ball is elastic and bounces of the wall. What is the momentum change for both balls? Is the momentum change identical? If not, then which ball would have the larger momentum change during the collision with the wall.

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This solution discusses momentum and collision.

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