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Q.

If a 5 kg body falls to the ground from a height of 30 m and if all its mechanical energy is converted into heat, the heat produced will be

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a

350 cal

b

150 cal

c

60 cal

d

6 cal

answer is A.

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Detailed Solution

$\begin{array}{l} dQ = mgh = 5 \times 9 .8 \times 30 = 150 \times 9 .8 joule \\ = 350 cal \end{array}$

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