A moving body weighing $400 N$ possesses $500 J$ of kinetic energy. Calculate the velocity with which the body is moving. $(g = 10 m s^{- 1})$

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Solution

Let
$W = m g$
$m = \frac{400}{10} = 40 k g$
We know that K.E. $= \frac{1}{2} m v^{2}$
$500 = \frac{1}{2} \times 40 \times v^{2}$
$v^{2} = 25$
$v = 5 m s^{- 1}$
Thus, velocity with which the body is moving = $5 m s^{- 1}$

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