1. The problem statement, all variables and given/known data A 96 kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 350 N. For the first 15m the floor is frictionless and for the next 15 m the coefficient of friction is .25. What is the final speed of the crate? 2. Relevant equations Change in K = Work E + Ffr * d = 0 1/2mv^2-1/2mv^2 + F(fr) d 3. The attempt at a solution I broke this up into two steps. The first 15 m I took the Work done, set it equal to 1/2mv^2 and got the velocity for the beginning of the second reference frame . Somethings not working though because I get the incorrect answer. Am I setting this up incorrectly?