What is the increase in potential energy of the sack of grain at this height?______ J(c) The rope being used to lift the sack of grain breaks just as the sack reaches the storage room. What kinetic energy does the sack have just before it strikes the ground floor?______ Jcan anyone explain this? thank you!
work = forceX distance increase in PE is the same amount of KE at ground is same again
a)W=F.S cos0 = -5148J -ve becoz angle b/w force disp is 180 b)mgh= 5148J c)K.E = 1/2 mv^2 (v^2 = 2gh) =5148J
