A Rock Is Dropped from Rest Off of a High

question 9

Multiple Choice

A rock is dropped from rest off of a high cliff on another planet, planet X. There is no atmosphere, and thus no air resistance, on planet X. At the end of 1 second, the rock is moving at a speed of 6 m/s. At the end of 2 seconds, it is moving at 12 m/s. How fast will the rock be moving at 4 seconds after being dropped?

• A) 36 m/s
• B) 24 m/s
• C) 20 m/s
• D) 40 m/s
• E) 18 m/s

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Definitions:

Depression

An extended period of significant decline in economic activity across an economy, characterized by high unemployment, low consumer spending, and reduced industrial output.

Full Employment

A situation in an economy where all available labor resources are being used in the most economically efficient way, often characterized by the absence of cyclical unemployment.

Unemployment Rate

The statistic representing the percentage of the labor force that is out of work but seeking employment.

World War II

A global conflict lasting from 1939 to 1945, involving most of the world's nations including all of the great powers, eventually forming two opposing military alliances: the Allies and the Axis.