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A 45-kg snowboarder starts at rest and slides down a frictionless 25m-high slope. He collides with a 65-kg ski patroller who was stopped at

A 45-kg snowboarder starts at rest and slides down a frictionless 25m-high slope. He collides with a 65-kg ski patroller who was stopped at the bottom of the slope. What is their velocity immediately after the collision?

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