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ma = 1 kg, va = 5 m/s, ke kiri
mb = 4 kg, vb = 0
vab = __?
HKM
pa + pb = pab
ma va + mb vb = (ma + mb) vab
1 • 5 = 4 • 0 = (1 + 4) vab
5 = 5 vab
vab = 1 m/s ←