15 joules of work are done by forces other than gravity in taking an object from a position 3 m above the ground to a position 8 m above the ground. What is the change in the gravitational potential energy of the object?
A. It increases by 11 joules.
B. It decreases by 5 joules.
C. It increases by 15 joules.
D. It increases by 5 joules
Answers: 3
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