Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): A person jumping out of the moving bus falls forward because his feet suddenly come to rest, while his body is in motion with the bus.
Reason (R): This is based on Newton's Second law of motions, which states that a body continues to be in its state of rest or of uniform motion in a straight line unless compelled by an external force to change that state.
In the light of the above statements, choose the most appropriate answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A) is correct but (R) is not correct
Assertion (A) — True. This is inertia of motion. While he is in the bus, his whole body moves with the bus. When his feet touch the ground they are stopped, but the upper part of his body goes on moving forward, so he falls forward.
Reason (R) — False. The law it states (a body stays at rest or in uniform motion in a straight line unless an external force acts on it) is Newton’s first law of motion, the law of inertia. Newton’s second law says that the force on a body equals the rate of change of its momentum (\(F=ma\)), so the Reason names the wrong law.