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s= 2,8 m
W= 560 N
h= 1,4 m
a. besar gaya F?
W/F = s/h
560/F = 2,8/1,4
2,8F= 560 × 1,4
2,8F= 784
F= 784÷2,8
F= 280 N
b. keuntungan mekanis?
KM= W/F
KM= 560/280
KM= 2