(Answered) Two balls undergo a perfectly elastic head-on collision

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Two balls undergo a perfectly elastic head-on collision, with one ball (m₂= 80.0 g) initially at rest at the edge of a table. The incoming ball m₁= 40.0 g has a speed of 20 m/s.

a) Find the final velocity of ball with mass m₁= 40.0 g. In what direction does the ball move after collision?

b) Find the final velocity of the second ball with mass m₂. In what direction does the ball move after collision?

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