Question

Newton's third law of motion can be used to explain:

• A. Why the passengers in a bus tend to fall backward when its starts suddenly
• B. Swimming of a man
• C. Motion of a rocket
• D. Both (B) and (C)

Answer 1

The correct option is D Both (B) and (C)

A man applies a force on water in the backward direction while swimming and according to Newton's third law, the water pushes the man with equal force in the forward direction and thus the man swims forwards.

Similarly, during the motion of a rocket, the gases exhausted in the backward direction gives a finite thrust to the rocket in the forward direction and thus helps it to move forwards.

Hence option D is correct.