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m = 60 kg
h = 20 m
t = 2 menit = 120 sekon
Ditanyakan
P = ... ?
Penyelesaian
P = W / t
P = F.s / t
P = m g h / t
P = (50 × 10 × 20) / 120
P = 10000 / 120
P = 83,3 joule / sekon