Elastic Collisions: A 50-g ball moving at 10 m/s in the +x direction suddenly collides head-on with a stationary ball of mass 100 g. If the collision is perfectly elastic, what is the velocity of each ball immediately after the collision?
A. -3.3 m/s, +6.7 m/s
B. +3.3 m/s, -6.7 m/s
C. -6.7 m/s, +3.3 m/s
D. +6.7 m/s, -3.3 m/s
Answer: A
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