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According to question only one-quarter of the heat produced by falling piece of ice is absorbed in the melting of ice.

1. mgh / 4 = mL
2. h = 4L / g
3. h = 4 × 3.4 × 10⁵ / 10
4. h = 136 km

Correct answer: mgh / 4 = mL

Solution

The heat produced by the falling ice is mgh, and only one-quarter of it is used for melting, equating to mL. Thus, mgh/4 = mL is the correct relation.

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