Use the conservation of momentum to answer the following question. A 47-kg girl and a 39-kg boy face each other on friction-free roller blades. The girl pushes the boy, who moves away at a speed of 0.2 m/s. The girl's speed is ___ m/s.
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It states that the total momentum of an isolated system remains constant if no external forces act on it. In this case, before the girl pushes the boy, both are stationary, so the total momentum of the system is 0. After the push, the boy moves with a momentum Show more…
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