A raft of mass $$30$$ kg and length $$5m$$ is floating on water. A man of mass $$60$$ kg is standing on the raft at one end. If the man starts walking towards the other end of the raft with a velocity of $$2$$ $$m/s$$ relative to the raft, what will be the velocity of the man relative to the shore? There is no friction between the raft and water.

Question

Infinity Learn · Accepted Answer

If V be the velocity of the raft relative to the shore, then conserving $$momentum.60$$×$$2$$−$$V+30$$×−$$V=0$$⇒$$V=43m/s$$ ∴Velocity of the man relative to the shore $$2$$−$$43m/s=23m/s$$

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