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Q.

The acceleration time graph of a particle moving in a straight line is as shown in figure. The velocity of the particle at time t = 0 is 2 m/s.  The velocity after 2 s will be       

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a

4 m/s

b

2 m/s

c

6 m/s

d

8 m/s

answer is A.

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Detailed Solution

v= area under a-t graph

v=12×2×4=4m/s

So, final velocity after 2 sec.

vf=u+v=2+4=6m/s

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