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A piece of ice falls from a height h so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is

[Latent heat of ice is 3.4×105 J/kg and g = 10 N/kg]

a
34 km
b
544 km
c
136 km
d
68 km

detailed solution

Correct option is C

mgh4 = mL⇒ h = 4Lg = 4×3.4×10510 = 136 km

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