A particle moves along a straight line such that its P displacement...

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A particle moves along a straight line such that its
P displacement at any time \( t \) is given by \( s=t^{3}-6 t^{2}+ \)

W \( 3 t+4 \) metres. The velocity when the acceleration is zero is:
(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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