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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

`24 ms^(-2)`

B

zero

C

`6 ms^(-2)`

D

`12 ms^(-2)`

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The correct Answer is:
D
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