A Boxcar of Mass 125 Tons at Rest Becomes Uncoupled

question 77

Multiple Choice

A boxcar of mass 125 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 9.0 seconds?

• A)4.0 m/s
• B)0.038 m/s
• C)31 m/s
• D)3.1 m/s
• E)0.31 m/s

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Definitions:

K

The symbol for Potassium, a chemical element with atomic number 19, highly reactive and essential for plant and animal life.

HAc

A shorthand notation for acetic acid, a colorless liquid organic compound with the chemical formula CH3COOH.

K

Symbol for Potassium, a soft, silvery-white metallic element essential for plant growth and human nutrition.

M

In the context of concentration, M stands for molarity, a measure of the concentration of a solute in a solution, defined as moles per liter.