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  4. Velocity-time graph for a body of mass 10 kg is shown in figure. Work-done on the body in first two seconds of the motion is :

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Q. Velocity-time graph for a body of mass $10\, kg$ is shown in figure. Work-done on the body in first two seconds of the motion is :Physics Question Image

JEE MainJEE Main 2016Work, Energy and Power

Solution:

image
$\frac{8}{V}=\frac{10}{50}$
$V=40 \,m / s$
$W=\frac{1}{2} \times 10 \times(1600-2500)$
$=\frac{1}{2} \times 10 \times(-900)$
$=-4500 \,J$