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If s=1/2t^3-6t, then acceleration at the...

If `s=1/2t^3-6t`, then acceleration at the time when the velocity vanishes, is

A

`3 unit//s^2`

B

`6 unit//s^2`

C

`2 unit//s^2`

D

None of these

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The correct Answer is:
B
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