A particle moves vertically with an upward initial speed \( v_{o} \) \( =10.5 \mathrm{~m} \mathr...

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A particle moves vertically with an upward initial speed \( v_{o} \) \( =10.5 \mathrm{~m} \mathrm{~s}^{-1} \). If its acceleration varies with time as shown in \( a-t \) graph in figure, find the velocity of the particle at \( t=4 \mathrm{~s} \).
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