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Recoil velocity on a raft

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A 55 kg swimmer is standing on a stationary 210 kg floating raft. The swimmer then runs off the raft horizontally with a velocity of 4.6 m/s relative to the shore. What is the recoil velocity that the raft would have if there were no friction and resistance due to the water?

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The solution calculates the recoil velocity on a raft of a swimmer than jumps off.

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A 55 kg swimmer is standing on a stationary 210 kg floating raft. The swimmer then runs ...

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