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  4. In figure shown, the graph shows the variation of acceleration of body with time t. The velocity of the body at t = 0 is zero. The velocity of the body at t = 30 s is

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Q. In figure shown, the graph shows the variation of acceleration of body with time t. The velocity of the body at $t = 0$ is zero. The velocity of the body at $t = 30\, s$ isPhysics Question Image

Motion in a Straight Line

Solution:

Area upto $30 \,s; = \frac{1}{2} \times 10 \times 2 + \frac{1}{2} ( 1 + 2 ) \times 5$
$+ 1 \times 10 + \frac{1}{2} \times 5 \times 1 = 30\,m/s$
$\Rightarrow v = 30\,m/s$