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A particle moves along a straight line `OX`. At a time `t` (in seconds) the distance `x` (in metre) of the particle is given by `x = 40 +12 t - t^3`. How long would the particle travel before coming to rest ?

A

`24m`

B

`40m`

C

`56m`

D

`16m`

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The correct Answer is:
C
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