Question

what is the linear momentum of rocket and escaping on firing.
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Answer 1

Since here both the assertion and reason are correct but the rocket major principle is Newton's 3rd Law of Motion, where it is irresponsible of motion.

Answer 2

Explanation:

A rocket works on the principle of conservation of linear momentum.

Reason

Whenever there is the change in momentum of one body, the same change occurs in the momentum of the second body of the same system but in the opposite direction.