What fraction of the total initial kinetic energy was lost

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A 1.2 kg toy car traveling at 2.0 m/s to the right collides and sticks to a 2.0 kg toy car traveling at 1.6 m/s to the left. What is the final velocity of the pair? What fraction of the total initial kinetic energy was lost in the collision? (i.e.- compare the sum of the kinetic energies before and after the collision)

Reference no: EM13317257

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