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A boy of mass 45-kg is on a moving ice sled A of mass 30-kg at...

A boy of mass 45-kg is on a moving ice sled A of mass 30-kg at a speed 10 m/s east on a frictionless frozen lake bed. He jumps off sled A with a relative speed 2.0 m/s east with respect to the sled and lands on another identical ice sled B at rest.

a) What is the speed of sled A after the boy jumps off it? What is the speed of the sled B after the boy lands on it?

b) If the system includes the boy plus two sleds, find the speed of center of the system before and after the boy lands on sled B.

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