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The deceleration exerienced by a moving ...

The deceleration exerienced by a moving motor blat, after its engine is cut-off is given by `dv//dt=-kv^(3)`, where `k` is constant. If `v_(0)` is the magnitude of the velocity at cut-off, the magnitude of the velocity at a time `t` after the cut-off is.

A

`(v_(0))/(sqrt((2v_(0)^(2) kt + 1)))`

B

`v_(0) e^(-kt)`

C

`v_(0)//2`

D

`v_(0)`

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The correct Answer is:
A
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