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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 speed is _______ m/s?

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The girl's momentum is equal and of opposite sign, so the total momentum remains zero.
30*Vgirl = 25*1.0

Solve for Vgirl

0.83 m/s

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