Two gliders are on a frictionless, level air track. Both gliders are free to move. Initially, glider A moves to the right and glider B is at rest. After the collision, glider A has reversed direction and moves to the left. The mass of glider A is one quarter of the mass of glider B. The system is defined as the two gliders Which of the following statements are true about change in momentum and external forces? A There is no change in momentum for the system B There are no external forces acting on the gliders

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