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# Physics Help?

A rocket accelerates from rest to an upward velocity of 4075 m/s

over a displacement of 375 km.

a) What is the acceleration of the rocket?

b) How long did it take the rocket to travel 375 km?

### 1 Answer

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- Andrew SmithLv 71 month ago
You are assuming that the acceleration was constant starting from zero. v^2 = 2as -> a = v^2 / 2s = 4075^2/(2 *375000) = 22m/s^2

2). Average speed = final speed/2 Time = distance / average speed = 375000/(4075/2) = 184 s

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