When you lift a heavy 5.0 kg crate straight up from ground level to a height of 2.0 m above ground level, then you have changed the crate's gravitational potential energy by
A. 98 N.
B. an undetermined amount, because it depends on how fast you lifted it.
C. 98 m2/s2.
D. 98 J.
E. 98 kg m/s.
Answer: D
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