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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 1m/s. what is the speed of the girl?

 

how do i calculate this?

 Jan 21, 2022
 #1
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Use conservation of momentum:  m1*v1+m2*v2 = 0  (assuming they were at rest to start with).

 

So:   30*v1 + 25*1 = 0;

 

Find v1 (the velocity of the girl) from this.

 Jan 21, 2022

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