A 230 kg crate hangs from the end of a rope of length L = 12.0m. You push horizontally on the crate with a varying force F to move it a distance d = 4.00m to the side. a) What is the magnitude of F when the crate is in this final position? During the crate's displacement, what are b) the total work done on it? c) the work done by the gravitational force on the crate, and d) the work done by the pull on the crate from the rope? i can't get part a) at all. the only formulas i know are W = (1/2)m(v2 - v02) and W = F * d. how do i find the force? my books answer is 797 N and i have no idea how they got it.