A 7000-Kg Coal Car of a Train Coasts at 7

question 47

Multiple Choice

A 7000-kg coal car of a train coasts at 7.0 m/s on a frictionless track when a 3000-kg load of coal is dropped vertically onto the car.The coal car's speed after the coal is added is

• A)2.1 m/s
• B)3.0 m/s
• C)4.9 m/s
• D)7.0 m/s
• E)16 m/s

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