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W=F.s= 40.2=80 j
P= 80/4=20 watt
2. W= F.s = 900 . 4= 3600 j
t = 4 detik
ho = 0
ht = 2 m
Dit : daya (P) = ...?
Jwb : P = Usaha/detik
= ΔEp/t
= Ept - Epo
= (mgh2-mgho)/t
= (40.2 -0)/4
= 20 J/s
2. Dik : F = 900 N
S = 4 m
Dit : Usaha (W) = ...?
Jwb : W = F x s
= 900 x 4
= 3600 Joule