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v₁² = 36 + 2 10 1,4
v₁² = 36 + 28
v₁² = 64
v₁ = 8 m/s
e = (- v₁' - v₂') / (v₁ - v₂)
e = (- 4 + 0) / (- 8 - 0)
e = -4/-8
e = 1/2
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