Q.

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

40m/s

b

20m/s

c

30m/s

d

10 m/s

answer is B.

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Detailed Solution

Area under acceleration - time graph = change in velocity

12(4+2)×10=v0

V=30ms-1

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