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A block of mass 2 kg is kept at origin a...

A block of mass 2 kg is kept at origin at t = 0 and is having velocity `4sqrt5m//s` in positive x - direction. The only force on it is a conservative and its potential energy is defined as `U=-x^(3)+6x^(2)+15` (SI units). Its velocity when the force acting on it is minimum (after the time t = 0 ) is

A

`8 ms^(-1)`

B

`4 ms^(-1)`

C

`sqrt(24) ms^(-1)`

D

`20 ms^(-1)`

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The correct Answer is:
A
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