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A block of ice with mass m falls into a lake. After impact, a mass of ice m/5 melts. Both the block of ice and the lake have a temperature of $0 ° C .$ If L represents the heat of fusion, the minimum distance the ice fell before striking the surface is

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$m L / 5 g$

$5 L / g$

$L / 5 g$

$g L / 5 m$

answer is A.

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Detailed Solution

$\begin{array}{l} (\frac{m}{5} L) = m g h \\ ∴ h = \frac{L}{5 g} \end{array}$

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