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A particle is moving in a straight line and passes through a
\( \mathrm{P} \) point \( O \) with a velocity of \( 6 \mathrm{~ms}^{-1} \). The particle moves with a constant retardation of \( 2 \mathrm{~ms}^{-2} \) for \( 4 \mathrm{~s} \) and there after
W moves with constant velocity. How long after leaving \( O \) does the particle return to \( O \)
(a) \( 3 s \)
(b) \( 8 s \)
(c) Never
(d) \( 4 s \)
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