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Hailstones fall from a certain height. I...

Hailstones fall from a certain height. If they melt completely on reaching the ground, find the height from which they fall.

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On reaching the ground, a hailstone of mass M loses potential energy which is converted into a heat energy required to melt it. In SI, potential energy lost = heat energy required for melting the hailstone Mgh
`=ML rArr gh = L `
` h = L/g , h = (80xx4.2 xx1000)/10`
` = 33.6 xx1000 m = 33.6 km `
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