Question

if a man jumps out of a boat the boat moves backward. why??

Answer 1

This is due to Newton's third law of motion .

The man jumps with an action so the boat gives the reaction that it moves backward.

So according to Newton's third law of motion every object has equal and opposite reaction.

Answer 2

Answer: because during the jump the man actually pushes the backward...it is same the friction like when we walk we pushes the road backward so we move forward.