- #1
Chanster
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Homework Statement
A 70-kg, starting from rest, is pulled across a floor with a constant horizontal force of 200 N. For the first 10 m the floor is frictionless, and for the next 10 m the coefficient of friction is 0.30. What is the final speed of the crate?
Homework Equations
W= -Delta PE
Wnc= DELTA PE+DELTA KE
F=ma
Ff=MuFn
W=Fd
The Attempt at a Solution
What I tried is to calculate the total work. So I calculate the work being done frictionless.
W=FD
W=200(10)
W=2000
Now I had to calculate work on friction
W=FD
W=(686)(.30)(10)
W=2058
This is how far I have gotten.