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19 September, 11:39

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.

A. 6.4 m/s

B. 11.3 m/s

C. 17.8 m/s

D. 21.6 m/s

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Answers (1)
  1. 19 September, 12:32
    0
    A is correct according to below calculation.

    m₁v₀₁+m₂v₀₂=m₁v₁+m₂v₂

    ((m₁v₀₁+m₂v₀₂) - m₁v₁) / m₂=v₂

    v₂ = ((.5*12-.75*16) + (.5*21.6)) /.75

    v₂=6.4 m/s
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