(A) : A rocket moves forward by pushing the surrounding air backwards.
(R) : Rocket derives the necessary thrust to move forward according to Newton’s third law of motion.

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(A) is true but (R) is false

(A) is false but (R) is true

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true and (R) is not the correct explanation of (A)

answer is D.

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Detailed Solution

A rocket moves forward (gains forward momentum) by ejecting out its gases with high energy and momentum in the opposite direction of its propulsion.
So, the assertion about pushing the surrounding air backwards is incorrect but as the rocket pushes the gases out, it gets propelled according to the newton's third law of action reaction.
So, the assertion is incorrect but the reason is correct.

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