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What is the kinetic energy of a body of mass $1\ kg$ moving with a speed of $2\ m/s$?
Here, mass of the body $m=1\ kg.$
Speed of the body $v=2\ m/s$
The kinetic energy of the body $K=\frac{1}{2}mv^2$
$=\frac{1}{2}\times 1\ kg\times(2\ m/s)^2$
$=\frac{1}{2}\times 4$
$=2\ J$
Therefore, kinetic energy of the body is $2\ J$.
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