A body of mass 20 kg is dropped from a height of 2 m. If g is taken to be equal to 10 $m / s^{2}$ , the kinetic energy of the body, just before striking the ground, will be :

400 J

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4 J

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40 J

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none of these

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Solution

The correct option is A 400 J
when the body is released from a height of 2 meters then all the potential energy will be converted to kinetic energy.
assuming base as a reference
$m g h + 0 = K . E . + 0$
so $K . E . = 400 J$

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