[tex]\cdot[/tex]1. The problem statement, all variables and given/known data A block of ice falls into a lake who's temperature is 00c. Half of a percent of it's mass melts. What is the minimum height the block falls from. 2. Relevant equations The Latent heat of water:L=79.7[Cal/gr] Potential energy: EP=mgh 3. The attempt at a solution the potential energy of the block transforms into heat which melts the ice. I'm using L, the latent heat in [Cal/Kg] in order to be in the SI unit system and get the height h in meters: mgh=79,700[itex]\cdot[/itex]0.005[itex]\cdot[/itex]m [itex]\Rightarrow[/itex]h=40[m] The answer should be 171[m], according to the book.