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If the mass of the rocket is 20,000 kg, then its weight is (m g) = (20,000 x 9.8) = 196,000 newtons.

That's the downward force acting on it.

What we want is an upward acceleration of 1 m/sec2.

The sum of all forces on it is F = m A, with A = +1.

F = (20,000) x (+1) = 20,000 newtons upward.

The sum of the forces on the rocket is

(Fgravity + Fengines) = (-196,000) + Fengines = 20,000

Fengines = 216,000 newtons, upward

Notice that immediately after blast-off, the required force immediately decreases. As fuel is

burned off, the mass of the rocket begins to decrease. In practice, the force of the booster

engines remains constant, and the rate of acceleration grows as the mass decreases.

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