Question

If a man jumps out from a boat the boat moves backwards why?
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Answer 1

Answer:

conservation of Mimentum of centre of mass of man boat system.

initial momentum = 0 as all at rest

final momentum = Mman × Vman + MboatxVboat = 0

so Vboat = - ( Mm/ Mb) Vman

negative indicate movement in opposite Direction.

Answer 2

Answer:

when a boy jumps he applied forces on the ground.similarly when he jumps from a boat the force on the boat makes him to move backawrd