A particle is moving so that its displacement \( \mathrm{s} \) is g...

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A particle is moving so that its displacement \( \mathrm{s} \) is given
\( \mathrm{P} \) as \( s=t^{3}-6 t^{2}+3 t+4 \) meter. Its velocity at the instant when its acceleration is zero will be:
W
(1) \( 3 \mathrm{~m} / \mathrm{s} \)
(2) \( -12 \mathrm{~m} / \mathrm{s} \)
(3) \( 42 \mathrm{~m} / \mathrm{s} \)
(4) \( -9 \mathrm{~m} / \mathrm{s} \)
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