A steel ball with a mass of 20.0 g is traveling at 5 m/s. It collides with a stationary steel ball with a mass of 35.0 g. If the collision is perfectly elastic, what is the speed of the second ball after the collision?
A. 2.5 m/s2.5 m/s
B. 3.6 m/s3.6 m/s
C. 5.2 m/s5.2 m/s
D. 8.2 m/s
8.2 m/s
Answer: D. 8.2 m/s