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The motion of a particle along a straigh...

The motion of a particle along a straight line is described by equation : `x = 8 + 12 t - t^3` where `x` is in metre and `t` in second. The retardation of the particle when its velocity becomes zero is.

A

`24ms^-2`.

B

Zero

C

`6ms^2`.

D

`12ms^2`.

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