Assertion: A rocket works on the principle of conservation of linear momentum.
Reason: Wheneven there is a 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 directio.

Options

A. If both assertion and reason are ture and reason is the correct 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

As the fuel in rocket undergoes combution, the gases so produced leave the body of the rocket with large velocity and give upthrust to the rocket. If we assume that the fuel is burnt at a constant rate, then the rate of change of momentum of the rocket will be constant. As more and more fuel gets burnt, the mass of the rocket goes on decreasing and it leads to increase of the velocity of rocket more and more rapidly.