A particle starts from rest, its acceleration - time graph is shown in figure. Find out velocity at t=4 sec

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A particle starts from rest, its acceleration - time graph is shown in figure. Find out velocity at $t = 4$ sec

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$40 m / s$

$20 m / s$

$30 m / s$

$10 m / s$

answer is B.

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Detailed Solution

Area under acceleration - time graph = change in velocity

$\Rightarrow \frac{1}{2} (4 + 2) \times 10 = v - 0$

$V = 30 m s^{- 1}$

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