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A particle moves along a straight line s...

A particle moves along a straight line such that its displacement at any time t is given by `s = (t^(3)-6t^(2)+3t +4)m`
The velocity when the acceleration is zero, is

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`v= ds"/"dt= 3t^(2)-12t+3, a= dv"/"dt= 6t-12`
when `a= 0, t= 12"/"6= 2s, v= 3xx 2 xx 2-12xx2+3`
`= -9 m"/"s`.
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