A moving body weighing $600 N$ possesses $750 J$ of kinetic energy. Calculate the velocity of the moving body? (Take acceleration due to gravity $g = 10 m s^{- 2}$ )

4 m s^{- 1}

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4.5 m s^{- 1}

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5 m s^{- 1}

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5.5 m s^{- 1}

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Solution

The correct option is C $5 m s^{- 1}$
Given,
Weight $W = 600 N$ ,
Acceleration due to gravity $g = 10 m s^{- 2}$ ,
Kinetic energy, $K E = 750 J$
We know, $W = m g$
So, $600 = m \times 10$
On solving we get, $m = 60 k g$
As we know, $K E = \frac{1}{2} m v^{2}$
So, $750 = \frac{1}{2} \times 60 \times v^{2}$
or, $v = 5 m s^{- 1}$

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