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…

A piece of ice falls from a height $\displaystyle h$ 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 $\displaystyle 3.4 \times 10^5 \mathrm{~J} / \mathrm{kg}$ and $\displaystyle \mathrm{g}=10 \mathrm{~N} / \mathrm{kg}$ ]