1. The problem statement, all variables and given/known data A ball is rolling on a rough horizontal surface with a deceleration of 2m/s(square). Find the coefficient of kinetic friction between the ball and the surface? 2. Relevant equations f(k) = u(k)N 3. The attempt at a solution u(k) = fk/N i use 2/10 my answer is 0.2 i think my answer is wrong. help me!!!!