# Hockey Collision

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Ice-hockey star Wayne Gretzky is skating at 13.0 m/s toward a defender, who in turn is skating at 5.0 m/s toward Gretzky. Gretzky's weight is 756 N; that of the defender is 900 N. Immediately after the collision, Gretzky is moving at 1.5 m/s in his original direction. You can ignore external horizontal forces applied by the ice to the skaters during the collision. What is the velocity of the defender immediately after the collision? Calculate the change in the combined kinetic energy of the two players.

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#### Solution Preview

u1 = 13.0 m/s

u2 = -5.0 m/s

m1 = 756/g kg = 756/9.8

m2 = 900/g kg = 756/9.8

v1 = 1.5 m/s

v2 = ?

By momentum ...

#### Solution Summary

This solution provides calculations. The momentum law is used and the change in kinetic energy is determined.

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