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A particle is moving in a straight line....

A particle is moving in a straight line. At time, the distance between the particle from its starting point is given by `x=t-6t^(2)+t^(3)`. lts acceleration will be zero at

A

t=1 unit time

B

t = 2 unit time

C

t = 3 unit time

D

t = 4 unit time

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