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Two balls collide head-on on a table. The first ball has a mass of 0.50 kg and an initial velocity of 12.0 m/s. The second ball has a mass of 0.75 kg and an initial velocity of -16.0 m/s. After the collision, the first ball travels at a velocity of -21.6 m/s. What is the velocity of the second ball after the collision? Assume a perfectly elastic collision and no friction between the balls and the table.

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2 answers

  1. When the balls are moving in opposite directions
    v₁= {-2m₂v₂₀ +(m₁-m₂)v₁₀}/(m₁+m₂)
    v₂={ 2m₁v₁₀ - (m₂-m₁)v₂₀}/(m₁+m₂)

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  2. -6.4 m/s

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