Question

a rocket with a lift off mass 1500 kg is blasted upwards with an initial acceleration of 3.5ms^-2 calculate the initial force of the blast​.​

Answer 1

$\bold{QUESTION}$

A rocket with a lift-off mass of 20,000 kg is blasted upwards with an initial acceleration of 5.0 ms-2. Calculate the initial thrust (force) of the blast.

$\bold{SOLUTION}$

Given,

Mass of the rocket, m = 20000 kg = 2 x 104 kg

Initial acceleration = 5 ms-2

g = 9.8 m/s2

The initial thrust (force) should give an upward acceleration of 5 ms-2 and should overcome the force of gravity.

Thus the thrust should produce a net acceleration of 9.8 + 5.0 = 14.8 ms-2.

Using Newton’s second law of motion, the initial thrust acting on the rocket

Thrust = force = mass x acceleration

F = 20000 x 14.8 = 2.96 x 10^5 N