A 30-Kg and a 2

question 72

Multiple Choice

A 3.0-kg and a 2.0-kg cart approach each other on a horizontal air track. They collide and stick together. After the collision their total kinetic energy is 40 J. The speed of their center of mass is:

• A) zero
• B) 2.8 m/s
• C) 4.0 m/s
• D) 5.2 m/s
• E) 6.3 m/s

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