1. The problem statement, all variables and given/known data A 95-kg box is sliding along a level floor with a vi of 15m/s. a) how large of a constant frictional force is needed to stop to box in a distance of 15m? b)What is the coefficent of friction between the box and the floor. 2. Relevant equations I tried to use vf^2=vi^2+2ad. 3. The attempt at a solution i used the above equation and i found the acceleration by putting vf as 0 but i am stuck.