At the Same Instant That a 0

question 61

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 without colliding.At the end of 2.0 s the velocity of the center of mass of the two-ball system is:

• A)11 m/s, down
• B)11 m/s, up
• C)15 m/s, down
• D)15 m/s, up
• E)20 m/s, down

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