A Freight Car Rolls Along a Horizontal Track at 12

question 221

Multiple Choice

A freight car rolls along a horizontal track at 12 m/s and hooks onto an identical freight car at rest. The coupled cars will

• A)come to a quick stop,
• B)roll at 3 m/s,
• C)roll at 6 mph,
• D)roll at 12 ms,
• Which makes sense because
• E)in the absence of external forces, trains in motion continue in motion.
• F)the acceleration of the car at rest equals the force of impact divided by the two masses.
• G)since twice the mass is moving, the speed will be half for the same momentum.
• H)energies before and after the collision remain the same.

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