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D. C.
Answers (1)
(M=8kg, h=100m, g=10m/s P.E= MGH=8×100×10=8000J or 8KJ)for the height of 100m. (M=8kg, h=40m, g=10m/s P.E= MGH=8×40×10=3200J or 3.2KJ)for the height of 40m.
