Question

Which of the following motion of law is (are) involved in the motion of the rocket?

• A. Newton's first law of motion
• B. Newton's second law of motion
• C. Newton's third law of motion
• D. All of the above.

Answer 1

Answer: (B), (C)

The correct options are
B Newton's second law of motion
C Newton's third law of motion

Rocket moves upwards against gravity so a force is generated by rocket thrust.

So $F_{net}=ma$

(Second law of motion)

And in rocket gases, eject from the back of rocket and the gases apply equal internal force.

(Newton third law of motion)