A particle starts moving along \( \mathrm{x} \)-axis from \( t=0 \)...

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A particle starts moving along \( \mathrm{x} \)-axis from \( t=0 \), its
\( \mathrm{P} \) position varying with time as \( x=2 t^{3}-3 t^{2}+1 \).

W At which time instants is its velocity zero?
(1) \( t=0,2 \mathrm{~s} \)
(2) \( t=0,3 \mathrm{~s} \)
(3) \( t=0,4 \mathrm{~s} \)
(4) \( t=0,1 \mathrm{~s} \)
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