Question

A 2.9 kg model rocket accelerates at 15.3 m/s2 with a force of 44 N. Before launch, the model rocket was not moving. After the solid rocket engine ignited, hot gases were pushed out from the rocket engine nozzle and propelled the rocket toward the sky. Which of Newton’s laws apply in this example? Check all that apply.

Answer 1

Answer:

A. the first law

B. the second law

C. the third law

Explanation:

Answer 2

Third law of motion is applicable in this question.

Force = 44.37 N

Explanation:

Given:

             mass of the model rocket 'm' = 2.9 kg

              acceleration of rocket 'a' = 15.3 m/$s^{2}$

So, as we know

                Force 'F' = mass x acceleration

                 ⇒ F = ma

                 ⇒ F = 2.9 x 15.3

                 ⇒ F = 44.37 N

Third law of Newton,

According to it's third law, every action has equal and opposite reaction.

Third law is applied in this case because when the rocket's engine is ignited, a force is generated due to the release of hot gases from the rocket engine nozzle. This generated force give the opposite and equal amount of force to the rocket and propelled the rocket towards the sky.