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A particle moves along a straight line s...

A particle moves along a straight line such that its displacement at any time t is given by `s = (t^(3)-6t^(2)+3t +4)m`
The velocity when the acceleration is zero, is

A

`3m//s`

B

`42m//s`

C

`-9m//s`

D

`-15m//s`

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The correct Answer is:
D
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