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 decreases by 5 joules. B. It increases by 5 joules. C. It increases by 11 joules. D. It increases by 15 joules.
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