Question
Question: A rocket of mass 120 kg is fired in the gravity free space. It ejects gases with velocity 600 m/s at...
A rocket of mass 120 kg is fired in the gravity free space. It ejects gases with velocity 600 m/s at the rate of 1 kg/s. What will be the initial acceleration of the rocket ?
A
1 m/s2
B
5 m/s2
C
10 m/s2
D
15 m/s2
Answer
5 m/s2
Explanation
Solution
Thrust force on the rocket,
F = vdtdm = 600 × 1 = 600 N
Acceleration of rocket,
a = NF
= 120600 = 5 m/s2