Homework Help: physics

Posted by Louis on Wednesday, June 13, 2012 at 11:38pm.

Two boys on skates push off from each other. The 40 kg boy moves to the left at 10 m/s. If the other boy moves to the right at 8 m/s, what is his mass?

physics - ajayb, Thursday, June 14, 2012 at 2:06am
Momentum of the 'two boys' system shall be conserved (because there is no external force in the horizontal direction)

So, m1v1 = m2v2
m1 = 40*10/8 = 50 Kg
physics - Anonymous, Thursday, June 14, 2012 at 3:28pm
Thank you

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