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 $^o C$. If $L$ represents the heat of fusion, the minimum distance the ice fell before striking the surface is
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 $^o C$. If $L$ represents the heat of fusion, the minimum distance the ice fell before striking the surface is
- A
$\frac{L}{{5g}}$
- B
$\frac{{5L}}{g}$
- C
$\frac{{gL}}{{5m}}$
- D
$\frac{{mL}}{{5g}}$
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