If a particle moves in a straight line according to the law \( \mat...

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If a particle moves in a straight line according to the law \( \mathrm{S} \)
\( \mathrm{P} \) \( =\frac{t^{3}}{3}-\frac{t^{2}}{2}-6 t+5 \), then its acceleration where velocity is

W) zero is
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