Work-Energy Theorem: in the Figure, a 900-Kg Crate Is on a Rough

question 61

Multiple Choice

Work-energy theorem: In the figure, a 900-kg crate is on a rough surface inclined at 30°. A constant external force is applied horizontally to the crate. While this force pushes the crate a distance of 3.0 m up the incline, its velocity changes from 1.2 m/s to 2.3 m/s. How much work does friction do during this process?

• A) - 3700 J
• B) - 7200 J
• C) + 3700 J
• D) + 7200 J
• E) zero

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