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Q.

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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a

mL/5g  

b

5L/g   

c

L/5g   

d

gL/5m

answer is A.

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Detailed Solution

(m5L)=mgh∴h=L5g

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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