Collision balls

When a cannon fires a cannon ball, the cannon will recoil backward because
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Two equal mass objects A and B collide elastically while travelling in opposite directions with same speed. After the collision, there velocities are
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A very heavy object moving with velocity v collides head-on with a very light object moving with velocity -v. The collision is elastic, and there is no friction. The heavy object barely slows down. What is the speed of the light object after the collision?
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Two cars collide in a completely inelastic collision at a North-South East-West intersection. The skid marks point roughly northwest. Concerning the initial directions of the two cars, this tells you that one driver was traveling:
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A rubber ball with a speed of 5.0 m/s collides head-on elastically with an identical ball at rest. What is the speed of the initially stopped ball after the collision?
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