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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 3.4x105J/Kg and g=10N/Kg]

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

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