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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 48 metre/ \( (\mathrm{sec})^{2} \), then a is equal to:
(1) 1
(2) 2
(3) 3
(1) 1
(2) 2
(3) 3
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