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S = 4 m
F = 1.250 N
h = 2 m
Dit : m?
F = m. h/s
1250 N = m. 2/4
2m = 1250 × 4
2m = 5000
m = 5000/2
m = 2500
Maka Berat kotak adalah : 2500 N
__Selesai__