Homework Help: physical science

Posted by Anonymous on Friday, May 4, 2012 at 7:13pm.

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 - Elena, Saturday, May 5, 2012 at 11:22am
The law of conservation of linear momentum
0 = m1•v1 - m2•v2,
v2 =30•1/25 = 1.2 m/s².

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