A sphere of mass 78 kg is attached to one end of a rope as shown in the figure below. It is found that the rope does an amount of work
W = 3550 J
in pulling the sphere upward through a distance 4.6 m. Find the work done by the force of gravity on the sphere.
My work
W= -78 * 9.8 * 4.6 = -3516.24
Answer: -3520