Solution: What is the speed of the coupled cars?

A 60 ton rail car moving at 1 mile/hr is instantaneously coupled to a stationary 40 ton rail car. What is the speed of the coupled cars?

Problem Statement: ME Board October 1996

A 60 ton rail car moving at 1 mile/hr is instantaneously coupled to a stationary 40 ton rail car. What is the speed of the coupled cars?

• A. 0.88 mph
• B. 1 mph
• C. 0.6 mph
• D. 0.4 mph

Problem Answer:

The speed of the coupled cars is 0.6 mph.

Solution:

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