In the Figure,a 700-Kg Crate Is on a Rough Surface

question 77

Multiple Choice

In the figure,a 700-kg crate is on a rough surface inclined at 30°.A constant external force P = 5600 N is applied horizontally to the crate.As the force pushes the crate a distance of 3.00 m up the incline,the speed changes from 1.40 m/s to 2.50 m/s.How much work does gravity do on the crate during this process?

• A) -10,300 J
• B) -3400 J
• C) +10,300 J
• D) +3400 J
• E) zero

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