At the Same Instant That a 0

question 71

Multiple Choice

At the same instant that a 0.50-kg ball is dropped from 25 m above Earth, a second ball, with a mass of 0.25 kg, is thrown straight upward from Earth's surface with an initial speed of 15 m/s.They move along nearby lines and pass each other without colliding.At the end of 2.0 s the height above Earth's surface of the center of mass of the two-ball system is:

• A)2.9 m
• B)4.0 m
• C)7.1 m
• D)7.9 m
• E)10.4 m

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