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A particle moves along a straight line OX. At a time
P \( t \) (in seconds) the distance \( x \) (in metres) of the particle from \( \mathrm{O} \) is given by
W \( x=40+12 t-t^{3} \). How long would the particle travel before coming to rest:
(1) \( 24 \mathrm{~m} \)
(2) \( 16 \mathrm{~m} \)
(3) \( 56 \mathrm{~m} \)
(4) \( 40 \mathrm{~m} \)
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