(Answered) A rubber raft of mass 3m floats past a dock at 1 msec

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