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A body of $2\ kg$ falls from rest. What will be its kinetic energy during the fall at the end of $2\ s$? $(Assume\ g=10\ m/s^2)$
Here given, mass of the body $m=2\ kg$
Initial velocity $u=0$
Gravitational acceleration $g=10\ m/s^2$
Time $t=2\ s$
On using the first equation of the motion $v=u+gt$
$v=0+10\times2$
Or $v=20\ m/s$
Therefore, the kinetic energy of the body $K=\frac{1}{2}mv^2$
$=\frac{1}{2}\times2\times20^2$
$=400\ J$
Therefore, the kinetic energy of the body at the end of $2\ s$ will be $400\ Joule$.
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