This question was part of my worksheet and I amcompletelyclueless as to how i should even begin solving it:

1. Two books, initially on the floor, are picked up andplacedon a shelf 2.0 meters off the floor. One has a mass of 1.0 kgandthe other has a mass of 2.0 kg. The gravitational filedstrengthnear the surface of Earth is approximately 10 n/kg.

a. Calculate the gravitational forceactingon each book as it rests on the shelf. What factors determinethesize of this force?

b. calculate the change in eachbooksgravitational potential energy as a result of being picked upoffthe floor and placed on the shelf. what factors determine thesizeof this change?

c. what is the difference ingravitationalpotential between the floor and the shelf? whatfactors determinethe size of this difference?

d. how does gravitational potentialdifferfrom gravitational potential energy?

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