In the Figure,a 900-Kg Crate Is on a Rough Surface

question 46

Multiple Choice

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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