A boy throws a 1.5 kg rock upward. To do so the boy applies a constant 38.5 N force upwards on the rock from point a to point b. then the rock continues upward to it's maximum height at point c.
a) Calculate the work that the boy performs from point a to point b.
b) Calculate the work that the force of gravity performs from point a to point b.
c) What is the total work done on the mass?