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