text: do these to plzzzzzzzz!? 5. [glencoe99 11.p.55.] a 96 n sack of grain is hoisted to a storage room 46 m above the ground floor of a grain elevator. unless otherwise directed, assume that air resistance is negligible. draw energy bar graphs to solve the problem. (a) how much work was required?  j (b) 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?  j  6. [glencoe99 11.p.56.] a 17 kg rock is on the edge of a 115 m cliff. unless otherwise directed, assume that air resistance is negligible. draw energy bar graphs to solve the problem. (a) what potential energy does the rock possess relative to the base of the cliff?  j (b) the rock falls from the cliff. what is its kinetic energy just before it strikes the ground?  j  (c) what speed does the rock have as it strikes the ground?  m/s this looks like an obvious attempt to have someone do your homework for you. why don't you ask how to solve these types of problems and then you would know.