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fa = koef gesek × gaya normal
gaya normal benda a = berat benda a = m × g
= 30 × 10 = 300
fa = 0,1 × 300 = 30
Wb = m × g = 20 × 10 = 200
Hukum Newton ii :
∑F = m × a
F - fa - Wb = (ma + mb) × a
F - 30 - 200 = (30+20) × 2
F = 100 + 230
= 330 N