Assertion: A rocket moves forward by pushing the surrounding air backwards.
Reason: It derives the necessary thrust to move forward according to Newton's third law of motion.

Options

A. If both assertion and reason are ture and reason is a true explanation of assertion.
B. If both assertion and reason are ture but reason is not the correct explanation of assertion.
C. If assertion is ture but reason is false.
D. If both assertion and reason are false.

Answer

A

Explanation

The rocket consists of a combustion chamber in which liquid or solid fuel is burnt. Hot gases (produced by combustion) are expelled from the tail of the rocket in the from of a jet with a very high exhaust velocity. Consequently the rocket rushes in the forward direction. The rocket exerts an action-force on the the gas-jet exerts a reactionary force on the rocket in the forward, applying the concept of Newton's third law of motion.