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v1 = 6 m/s
m2 = 6 kg
v2 = 0
v2' = - 2 m/s
maka
m1.v1 + m2.v2 = m1.v1'+m2.v2'
4.6 + 6.0 = 4.v1' + 6.(-2)
24 = 4.v1' - 12
4 v1' = 24 + 12
= 36
v1' = 9 m/s
silahkan di rechecek kembali sebelummenjadi jawaban akhir
semoga membantu