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  4. A particle starts from rest at t=0 and moves in a straight line with acceleration as shown in figure. The velocity of the particle at t=3 s is <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-h6tsf4q65lkf.png />

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Q. A particle starts from rest at $t=0$ and moves in a straight line with acceleration as shown in figure. The velocity of the particle at $t=3 \, s$ is
Question

NTA AbhyasNTA Abhyas 2020Physical World, Units and Measurements

Solution:

Velocity at $3s=$ total algebraic sum of area under the curve
$v = 4 \times 2 - 4 \times 1 = 4 m/s$