Question

(a)State newton's third law of motion.
(b) Why does a boat move backward, when a man jumps out of a boat to the bank of a river?

Answer 1

Dear Student

Newton's third law of motion states that for every action there is an equal and opposite reaction.

A boat move backward, when a man jumps out of a boat to the bank of a river because to step out of the boat, the man presses the boat with foot in the backward direction. The push of the man on the boat is the action ( force). The boat exerts an equal force on the man in the forward direction which enables him to move forward. This force exerted on the man is reaction ( force ).

Since the boat is floating on the water and not fixed, it moves backward due to the action force exerted by man.