__Question 5.9__:
A rocket with a lift-off mass 20,000 kg is blasted upwards with an initial acceleration of 5.0 m s

^{–2}. Calculate the initial thrust (force) of the blast.

__Solution__:Mass of the rocket,

*m*= 20,000 kg

*a*= 5 m/s

^{2}

Acceleration due to gravity,

*g*= 10 m/s

^{2}

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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