Question

To project the rockets which of the following principle(s) is /(are) required?
(a) Newton's third law of motion
(b) Newton's law of gravitation
(c) law of conservation of linear momentum
(d) both a and c

Answer 1

Answer:

a)

Explanation:

It says 'project' .

Answer 2

To project the rockets Newton’s third law of motion and the law of conservation of linear momentum principles are required.

• Option (d) both a and c is correct.
• In the case of a rocket, the engine emits gases in the downward direction, in turn, these gases force the rocket to move in the upward direction.
• Newton’s 3rd law is applicable.
• The gases of the rocket and the rocket are stationery at the start, their total momentum will be zero.
• Once the rocket starts, the momentum imparted to the rocket is equal and opposite to that of the gases.
• Hence their total momentum is zero.
• The law of conservation of linear momentum is also applicable.