What is the kinetic energy of a ball of mass 500 g and moving with a speed of 2 $m s^{- 1}$ ?

4 J

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1 J

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41 N

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4 ergs

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Solution

The correct option is B 1 J
K.E = $\frac{1}{2} m v^{2}$
$\frac{1}{2} \times 0.5 \times (2)^{2}$
$= \frac{1}{2} \times \frac{1}{2} \times 2 \times 2 = 1 J$

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