An Empty Railroad Car Traveling at a Speed of 21

question 67

Multiple Choice

An empty railroad car traveling at a speed of 21 m/s strikes a second car at rest.The second car,being full with passengers,has twice the mass of the first car.If the cars lock together as a result of the collision,their common speed afterward is

• A)11 m/s.
• B)10 m/s.
• C)9.0 m/s.
• D)8.0 m/s.
• E)7.0 m/s.

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