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help with Physics ?
A dog and a cat are running straight towards each other. The dog is going 2.5 m/s and has a mass of 5 kg. The cat is going 1.1 m/s and has a mass of 1.3 kg. Assume the dog is running initially with a positive velocity. The two animals collide. After the collision, if the dog bounces backward at 1.4 m/s, then the cat's speed must be
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