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Find the mass of a rocket as function of...

Find the mass of a rocket as function of time , it it moves with a constant acceleration `alpha` in te absence of external forces. The gas escape with a constant velocity u relative to the rocket and its mass initially was `m_(0)`

A

`m = m_(0) e^(-(alpha//u)t)`

B

`m = m_(0) e^(-(2alpha//u)t)`

C

`m = m_(0) e^(-(u//alphau t))`

D

`m = m_(0) e^(-(2u//alpha t))`

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The correct Answer is:
A
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