A rocket with a lift-off mass 20,000 kg is blasted upwards with an initial acceleration of 5.0 m/s². Calculate the initial thrust (force) of the blast.

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Ques: A rocket with a lift-off mass 20,000 kg is blasted upwards with an initial acceleration of 5.0 m/s². Calculate the initial thrust (force) of the blast.

Ans: Mass of the rocket, m = 20,000 kg

Initial acceleration, a = 5 m/s2

Acceleration due to gravity, g = 10 m/s2

Using Newton’s second law of motion, the net force (thrust) acting on the rocket is

given by the relation:

F – mg = ma

F = m (g + a)

= 20000 × (10 + 5) 

= 20000 × 15 

= 3 × 10^5 N. 


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