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Vt^2 = Vo^2 - 2gh
0 = 20^2 - 2.10.h
0 = 400 - 20h
20h = 400
h = 400:20
h = 20 m
atau
EM1 = EM2
Ek = Ep
1/2.m.v^2 = m.g.h
1/2.2.20^2 = 2.10.h
400 = 20h
h = 400:20
h = 20 m