A Block Slides on a Rough Horizontal Surface from Point

question 39

Multiple Choice

A block slides on a rough horizontal surface from point A to point B.A force (magnitude P = 2.0 N) acts on the block between A and B,as shown.Points A and B are 1.5 m apart.If the kinetic energies of the block at A and B are 5.0 J and 4.0 J,respectively,how much work is done on the block by the force of friction as the block moves from A to B?

• A)-3.3 J
• B)+1.3 J
• C)+3.3 J
• D)-1.3 J
• E)+4.6 J

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Definitions:

Knights of Labor

A significant American labor organization in the late 19th century, advocating for the rights of workers, including shorter workdays and an end to child labor.

Terrence V. Powderly

A leader of the Knights of Labor, a key labor organization in the United States during the late 19th century, which aimed to promote workers' rights and social reform.

African-Americans

An ethnic or racial group in the U.S. that has heritage from any of the African black racial groups.

Labor Movement

A social and economic campaign advocating for workers' rights and interests, including better pay, working conditions, and hours.