Monte works at the local grain elevator during the summer months. He uses the lift to hoist a 122.1-Newton sack of grain to a storage area 28.5 meters above the ground.

a. what is the potential energy of the sack when in the storage room?

b. How much work was done in lifting the sack to this height?

c. If the sack were to fall back down to the elevator floor, how much kinetic energy would it have just prior to landing?