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 m/s

B

4 m/s

C

`10sqrt24m//s`

D

`20 m//s`

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A

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