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aqmal_12

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## Homework Statement

Suppose that the acceleration of a model rocket is proportional to the difference between 100 ft/sec and the rocket's velocity. If it is initially at rest and its initial acceleration is 50 ft/sec2, how long will it take to accelerate to 80 ft/s?

## The Attempt at a Solution

I've tried to solve like this.

Vi=0 a=50ft/s^2 Vf=80ft/s

a=k(100-v)

50=k(100-0)

k=0.5

Sorry but that's all I know. I'm new to this topic. I hope you can guide me. Thank you so much.