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s = 80cm = 0,8m
ditanya: W?
W = F.S
= 50. 0,8
= 40J
Jawabannya: D
= (40+60) - 50
= 50 N
W = F x s
= 50 N x 80 cm
= 50 N x 0,8 m
= 40 J (D)