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A 0.440-kg hockey puck, moving east with a speed of 2.90 m/s , has a head-on...

A 0.440-kg hockey puck, moving east with a speed of 2.90 m/s , has a head-on collision with a 0.860-kg puck initially at rest.

Assuming a perfectly elastic collision, what will be the speed (magnitude of the velocity) of each object after the collision?

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