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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^3 +3t+4)` metres. 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:
C
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