A particle moves in a straight line so that it covered a distance \...

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A particle moves in a straight line so that it covered a distance \( a t^{3}+b t+5 \) metre in \( t \) seconds. If its acceleration after \(4\) seconds is \( \mathrm{48~ metre}\)/ \( (\mathrm{sec})^{2} \), then a is equal to:
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