The motion of a particle along a straight line is described by equation : \( x=8+12 t-t^{3} \) w...

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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:
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