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h0 = 100 m
h2 = 27 m
Dit W ?
jawab.
v =√2gh
= √ 2 . 10 . 100
= √400 = 20 m/s
Ek = 1/2 mv^2
= 1/2 . 2 . 400
= 400 joule
W = ΔEp = mgh1 - mgh2
= (2 . 10 . 100) - (2 . 10 . 27)
= 2 000 - 540
= 1 460 Joule
jadi usahanya 1 460 Joule