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m = 2 ton = 2000 kg
h = 6 m
t = 2 menit = 120 s
ditanyakan :
P = ?
jawab :
P = W/t
P = F s / t
P = m g s /t
P = 2000 x 10 x 6 / 120
P = 1000 watt
Daya (P) = usaha atau energi (W) : t
W di sini termasuk energi potensial karena diketahui jarak yang harus ditempuh
W = m x g x h = 2000 x 10 x 6 = 120000 joulle
P = 120000 : 120 = 1000 watt