A 40-kg skater moving at 4 m/s overtakes a 60-kg skater moving at 2 m/s in the
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A 40-kg skater moving at 4 m/s overtakes a 60-kg skater moving at 2 m/s in the same direction and collides with her. The two skaters stick together.
(a) What is their final speed?
(b) How much kinetic energy is lost?
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