Three blocks with mass m1=1 kg, m2=2 kg, and m3=3 kg(no angular momentum or energy) are arranged in order on a frictionless horizontal track which is attached to a vertical circular track at the horizontal track's end. The first mass is struck so that it has speed v1. It collides with m2 elastically. Then m2 slides along and collides with m3 inelastically. The final mass enters the circular track of radius of 1 m and reaches an angle pi/3 How much energy is lost during this process?

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