take the masses to be m₁ and m₂ (inertia is mass) and velocity V
momentum initially is m₁V and –m₂V
momentum after is (m₁+m₂)(V/2)
conservation of momentum, set them equal
m₁V – m₂V = (m₁+m₂)(V/2)
m₁ – m₂ = (m₁+m₂)(1/2)
2m₁ – 2m₂ = m₁ + m₂
m₁ – 3m₂ = 0
m₁ = 3m₂
m₁/m₂ = 3.0 (answer)
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