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

Question

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

Quizplus · Accepted Answer

The Answer of 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

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