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Glider A , traveling at 8 . 4 m / s on an air track, collides perfectly elastically with glider B traveling at 4 .

 Glider A, traveling at 8.4 m/s on an air track, collides perfectly elastically with glider B traveling at 4.7 m/s in the same direction. The gliders are of equal mass. What is the final speed of glider B ?  

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