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The position x of a particle with respec...

The position x of a particle with respect to time t along x-axis is given by `x=9t^(2)−t^(3)` where x is in metres and t is in seconds. What will be the position of this pariticle when it achieves maximum speed along the + x direction ?

A

54m

B

81m

C

24m

D

32m

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