APFIVE Kinetic Energy in an Elastic Collision
A 0.5 kg ball moving horizontally at 8.0 m/s strikes a 1.5 kg ball at rest. After the elastic collision, the 0.5 kg ball rebounds at an angle of 60° to its original direction. What fraction of its initial kinetic energy does the 0.5 kg ball retain?
A
3/4
B
1/2
C
1/8
D
1/4
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