Which one of the following possesses potential energy?

A man of mass 20 kg is running in a straight line with velocity 10 m/s. What is value of his kinetic energy?

The velocity $(v)$ of a particle of mass $m$ moving along x-axis is given by $v = \alpha \sqrt {x}$, where $\alpha$ is a constant. Find work done by force acting on particle during its motion from $x = 0$ to $x = 2m$.

When the speed of a body is doubled, its kinetic energy becomes ;

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