1. The problem statement, all variables and given/known data http://img406.imageshack.us/img406/117/physicsprob3pp6.jpg [Broken] known date 1. angle= 29 degrees 2. frictional force = 48 N 3. mass of cart = 16 kg 4. displacement = 22 meters 5. velocity = constant 2. Relevant equations F=ma F(s)=mas W=F cos theta (s) 3. The attempt at a solution this problem gave me a headache when i attempted to solve it. first i resolved that since velocity is constant, then a=0 but that would mean that the force = 0 and that would say that the person is not exerting any force on the cart. that's all i have down. v=constant a=0 F(s)=mas 0=0 whats the force shes exerting then? i know how to figure out work, thats easy. just use the work formula.