1. The problem statement, all variables and given/known data Assume that a hailstone at 0◦C falls through air at a uniform temperature of 0◦C and lands on a sidewalk also at this temperature. From what initial height must the hailstone fall in order to entirely melt on impact? The acceleration due to gravity is 9.8 m/sec2 and the latent heat of fusion of water is 3.3 × 10^5 J/kg . Answer in units of km 2. Relevant equations 3. The attempt at a solution I'm guessing it has to do with calculating the time based on the acceleration and height. Or maybe something to do with work being done by gravity. In any case, it seems weird that it doesnt give the mass of the hailstone. We only briefly went over this stuff on the last day of class, and I couldnt find anything too similar in the book.