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A boy having a mass of 40kg stands at on...

A boy having a mass of `40kg` stands at one end A of a boat of length `2m` at rest. The boy walks to the other end B of the boat and stops. What is the distance moved by the boat? Friciton exists between the feet of the boy and the surface of the boat. But the friction between the boat and the water surface may be neglected. Mass of the boat is `15kg`.

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