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mailmas

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## Homework Statement

A person whose mass is 20 kg needs to accelerate vertically from the surface of the Earth at 5.0m/s^2

and is trying to pick which rocket he should strap to his back. How much thrust

does he need if each rocket has a mass of 30 kg?

## Homework Equations

F=ma

## The Attempt at a Solution

F = m*a

F = 50*5 = 250N

I don't understand why the answer is 740N

no friction, no air resistance, only gravity and the normal force

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