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physical science

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a 30 kg girl and a 25 kg boy face each other on friction-free roller blades.the girl pushes the boy,who moves away at a speed of 1.0 m/s.the girl,s speed is _ m/s.

  • physical science -

    The law of conservation of linear momentum
    0 = m1•v1 - m2•v2,
    v2 =30•1/25 = 1.2 m/s².

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