Asked by Ina
                Croquet ball A moving at 8.0m/s makes a head on collision with ball B of equal mass and initially at rest. Immediately after the collision ball B moves forward at 7.1m/s . 
What fraction of the initial kinetic energy is lost in the collision?
            
        What fraction of the initial kinetic energy is lost in the collision?
Answers
                    Answered by
            bobpursley
            
    initial Ke  calculate
final Ke, calculate
ke lost=initial-final
fractction lost=kelost/keinitial
    
final Ke, calculate
ke lost=initial-final
fractction lost=kelost/keinitial
                    Answered by
            awesome dude
            
    (-2(vb)^2+2(va+vb))/va^2
where
va is first velocity and
vb is 2nd given velovty
    
where
va is first velocity and
vb is 2nd given velovty
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