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• tumbukan
m1 = 0,4 kg, v1 = 6 m/s
m2 = 2 kg, v2 = 0
tumbukan tidak lenting sama sekali
v' = ___?
HKM
Σp = Σp'
m1 v1 + m2 v2 = (m1 + m2) v'
0,4 • 6 + 0 = (0,4 + 2) • v'
2,4 = 2,4 v'
v' = 1 m/s ← jwb
m1. V1 = m2.V2
0.4 x 6 = 2 x V2
V2 = 1.2 m/s