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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 `x =t^3-6t^2 +3t +4` in m. The velocity when acceleration is zero is

A

` 3 ms^-1`

B

` -12 ms^-1`

C

` 42 ms^-1`

D

` -9 ms^-1`

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