1. The problem statement, all variables and given/known data this question is from the book introduction to mechanics.. question 4.12 During the Second World War the Russian, lacking sufficient parachutes for airborne operations, occasionally dropped soldiers inside bales of hay onto snow. The human body can survive an average pressure on impact of 30 lb/in2. Suppose that the lead plane drops a dummy bale equal in weight to a loaded one from an altitude of 150 ft, and that the pilot observes that it sinks about 2 ft into the snow. If the weight of an average soldier is 144 lb and his effective area is 5 ft2, is it safe to drop the men? 2. Relevant equations So, I use work-energy theorem to solve it.. but i could not find the later part after this equation.. work-energy equation i got is : Kb-Ka = integration(a,b) (F •dR) 3. The attempt at a solution I am not sure whether my work energy equation is correct.. So anyone here would like to help me? sorry for trouble.. thx.. maybe anyone of you guys want to give me some hint on it.. thx alot..