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Jawaban:
1200 N
Penjelasan:
f total = 600 + 500 + 600 – x
=1700 – x
w = gaya
f = usaha
s = jarak
W = F x S
10.000J = 1700 – x × 20
10.000 : 20 = 1700 – x
500 = 1700 – x
x = 1700 – 500
x = 1200
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