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  4. A particle of mass m at rest is acted upon by a force F for a time t. Its kinetic energy after the interval t is

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Q. A particle of mass $m$ at rest is acted upon by a force $F$ for a time t. Its kinetic energy after the interval $t$ is

Work, Energy and Power

Solution:

$E=\frac{P^{2}}{2 m}=\frac{(F t)^{2}}{2 m} \quad\left\{F=\frac{P}{t}\right\}$
$E=\frac{F^{2} t^{2}}{2 m}$