A box of weight $150 k g f$ has gravitational potential energy stored in it equal to $14700 J$ . Find the height of the box above the ground. (Take $g = 9.8 N$ $k g^{- 1}$ )

10 c m

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10 k m

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1 m

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10 m

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Solution

The correct option is D $10 m$
$P . E = m \times g \times h$
Given $m \times g = 150 k g f = 150 \times 9.8 N$ .
$14700 = 150 \times 9.8 \times h$
$h = 14700 / (150 \times 9.8)$
$h = 10 m$ .

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