A particle is moving in a straight line such that its distance \( s...

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A particle is moving in a straight line such that its distance \( s \) at any time \( t \) is given by \( s=\frac{t^{4}}{4}-2 t^{3}+4 t^{2}-7 \). Find when its velocity is maximum and acceleration minimum.
\( \mathrm{P} \)
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