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  4. The velocity-time graph of a particle moving in a straight line is shown in figure. The mass of the particle is 2 kg. Work done by all the forces acting on the particle in time interval between t=0 to t=10 s is

Q. The velocity-time graph of a particle moving in a straight line is shown in figure. The mass of the particle is $2\, kg$. Work done by all the forces acting on the particle in time interval between $t=0$ to $t=10\, s$ isPhysics Question Image

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Solution:

From work-energy theorem,
$W =\Delta KE =K_{f}-K_{i}=\frac{1}{2} m\left(v_{f}^{2}-v_{i}^{2}\right)$
$=\frac{1}{2} \times 2\left[(-20)^{2}-(10)^{2}\right]=300\, J$

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