Question

7) A 500 kg rocket is fired straight up from the earth, the engines providing 7500 N of thrust. Its
acceleration is
A) 4.5 m/s2
B) 5.2 m/s
C) 9.8 m/s2
D) 15 m/s2​

Answer 1

Answer:

According to Newton's Second Law,

Force = Mass × Acceleration

According to the question,

• Mass of the rocket = 500 kg
• Thrust = 7500 N
• Acceleration = ?

Thrust is also known as Force.

Applying the Second Law, we get,

⇒ 7500 N = 500 kg × a

⇒ a = 7500 N / 500 kg

⇒ a = 75 N / 5 kg

⇒ a = 15 m/s²

Therefore Acceleration of the rocket is 15 m/s².

Answer 2

Answer:

option d) 15 m/s² is correct answer.