Oh ok, i got 7.4 for final velocity
So I did what you told me and calculate the the force applied again i got 4k. I subtract that from 2058. I got 1942, with that I just set it equal to 1/2mv^2 and i solve for v and got 7.4?
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=...