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The position x of a particle with respe...

The position x of a particle with respect to time t along x is in given by `x =9t^2-t^3` where x is in meters and t in second. What will be the position of this particle when it achieves maximum speed along the `"+x` directions?

A

24 m

B

32 m

C

54 m

D

81 m

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