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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Definitions:

Price Discrimination

A pricing strategy where identical or substantially similar goods or services are sold at different prices by the same provider in different markets or segments.

Marginal Revenue

The additional revenue that a company earns from selling one more unit of a product.

Monopolistic Competitor

A market structure where many companies sell products that are similar but not identical, allowing for some degree of market power.

Short Run

The length of time it takes all fixed costs to become variable costs.