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= 300 . 10 . 2
= 6000 J (D)
m= 300 kg
h= 2 m
s= 4 m
ditanya
W=...?
jawab
⇒mencari berat
w= m.g
w= 300×10
w= 3.000 N
⇒mencari gaya
w × h = F × s
3.000 x 2 = F × 4
6.000 = 4F
F= 6.000/4
F = 1.500 N
⇒mencari usaha
W= f × s
W= 1.500 x 4
W= 6.000 Joule (D)