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The question is copied from Burdens Dynamics and Mechanical Sciece Self Study.

Question) Three balls of mass 2kg each, have a coefficient of restitution of k = 0.85. Ball A is released at a height of 1m from rest and strikes ball B and then ball B strikes ball C.

a) Determine the velocity of ball A just before it strikes ball B.

b) Write down the conservation of momentum equation for the analysis of the impact between ball A and ball B.

c) Calculate the velocity of each ball following the final impact.

d) What is the kinetic energy of the system just before the first impact.

Assume that the balls slide without friction. K is the ratio of relative speeds of balls after and before the impact K = v2-v1/u1-u2.

My conservation of momentum is the only piece I truly understand. After the final impact how would you go about analytically calculating the velocity as stated?