A Boxcar of Mass 300 Tons at Rest Becomes Uncoupled

question 35

Multiple Choice

A boxcar of mass 300 tons at rest becomes uncoupled on a 2.0° grade.If the track is considered to be frictionless,what speed does the boxcar have after 8 seconds?

• A) 8.5 m/s
• B) 0 m/s
• C) 35.1 m/s
• D) 2.7 m/s
• E) ​0.3 m/s

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Definitions:

Dark Brown

A color, often associated with earth or wood, that signifies a deep, rich brown shade.

C Soil Horizon

The layer of soil that consists of weathered parent material, lying beneath the A (topsoil) and B (subsoil) horizons.

Weathering

Weathering is the process by which rocks, soil, and minerals are broken down by the Earth's atmospheric and biological conditions, such as temperature changes and chemical reactions.

Parent Material

The underlying geological material (generally bedrock or a superficial or drift deposit) in which soil horizons form.