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I have posted a link there to this topic so the OP can see my work.Calculus: Work problems help needed?

Need help on this work problem

You are on top of the roof of 120 meter tall building with a 120 meter rope weighing 5kg. Another person on the ground at the base with another 120 meter metal rope weighing 60kg and a bucket with weight of 4kg holding 40kg of sand. Acceleration of gravity is 9.81 m/sec^2.

a) You drop one end of the rope off the building and the other person attaches the end of his metal rope to your rope. How much work do you do pulling the rope back up the roof so that the metal rope is dangling from the edge of the roof down to the ground.

b)Your friend then attaches the end of the metal rope to the bucket. How much work do you do pulling bucket and the metal rope up to the roof?