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h = 12
Ep = 1200 J
g = 10 m/s2
v = 6 m/s
Ditanyakah : Ep ?
Dijawab:
mencari massa
Ep = m.g.h
1200 = m.10.12
1200 = 120 m
m = 1200/120
m = 10 kg
mencari energi kinetik
Ek = 1/2.m.v^2
Ek = 1/2 . 10 . 6^2
Ek = 5 x 36
Ek = 180 J -> B