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A particle moves along a staight line su...

A particle moves along a staight line such that its displacement at any time t is given by `s=t^3-6t^2+3t+4m`. Find the velocity when the acceleration is 0.

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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