1. The problem statement, all variables and given/known data Two boxes of equal mass m are connected by a light string over a massless pulley, and rest on surfaces of inclination θ and φ, θ>φ. The boxes are released from rest. The coefficient of kinetic friction between the boxes and the surfaces is μ. Determine the magnitude of the velocity of the boxes when they have moved distance s. 2. Relevant equations W=(1/2)mv^2 3. The attempt at a solution Well, this is rather simple question when using the work energy equations, setting the total force on each of the masses in x direction times the distance equal to 1/2 mv^2. I have gotten the right answer this way. But I've realized that I could probably solve it using another method, which was to use integration by changing the acceleration I get into v*dv/ds. Sorry for the bad quality picture and I don't know how to turn it around. But basically, I get an equation v=√[((g)(sinθ-sinφ)-μ(cosθ+cosφ))s] but when I plug it in a sample question, the velocity comes out to be a bit off. Any help or criticism will be appreciated.