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A piece of putty of mass m = 0.75 kg and velocity v = 2.5 m/s moves on a horizontal frictionless surface. It collides with and sticks to a rod of mass M = 2.0 kg and length L = 0.9 m which pivots about a fixed vertical axis at the opposite end of the rod as shown. What fration of the initial kinetic energy of the putty is lost in this collision? KElost/KEinitial =

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