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Two carts with masses of 4.80 kg and 2.78 kg move toward each other on a frictionless track with speeds of 4.94 m/s and 3.17 m/s respectively. The carts stick together after colliding head-on. Find the final speed.
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John is traveling north at 20 meters/second and his friend Betty is traveling south at 20 meters/second. If north is the positive direction, what are John and Betty's speeds?
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