1. The problem statement, all variables and given/known data I want to be able to calculate how far a ball has travelled when rolled along a flat surface at each second. Lets say the values are 2kg for ball, the force is 100N and co-efficient of friction is 0.2. 2. Relevant equations F(n) = -mg a = f/m 3. The attempt at a solution I need to find Normal Force (Fn) which is F(n) = -mg = -(2 kg) * (-9.8 m/s^2) = 19.6 N I can now use a = f/m a = F - (mu)F(n) / m = 100 - ((0.2)(19.6) = 3.92 N / 2 = 1.96 m/s) = 98.04 m/s So, after 1 second, ball has travelled 96.08 metres (98.04 - 1.96) 2 seconds = 194.12 (98.04 + (98.04 - 1.96)) Is this correct?