A 30-Kg Cart and a 2

question 56

Multiple Choice

A 3.0-kg cart 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)0 m/s
• B)2.8 m/s
• C)4.0 m/s
• D)5.2 m/s
• E)8.0 m/s

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Definitions:

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