A rubber raft of mass 3m floats past a dock at 1 ms toward, Ask an Expert

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A rubber raft of mass 3M floats past a dock at 1 m/s toward the east. A girl of mass 2M runs down the dock and jumps in the raft with a speed of 2 m/s in the north direction.

A.) Find the final velocity of the raft and girl.

B.) How much kinetic energy was lost in the collision?

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