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The position x of a particle varies with...

The position x of a particle varies with time (t) as x=`at^2 - bt^3` . The acceleration at time t of the particle will be equal of zero. When is equal to

A

`a/b`

B

`(2a)/(3b)`

C

`a/(3b)`

D

zero

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The correct Answer is:
C
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