Example 1

An elastic collision

The two carts have equal mass and approach each other with roughly  equal speed.  Their momenta have roughly equal magnitude and opposite direction before and immediately after the collision.  The momentum of each cart changes direction during the collision. The two players have roughly equal mass and approach each other with roughly  equal speed.  Their momenta have roughly equal magnitude and opposite direction before and immediately after the collision.  The momentum of each player changes direction during the collision.

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