I have been stuck on this physics question: An object is sliding along a flat surface with an initial speed of 30 m/s. What must the coefficient of kinetic friction be between the object and the surface if the object slides to a stop in 10m? What would be the speed of the object after it had only slide half that distance? So I know that uk = Fk/FN and that Fd = 1/2mv(initial)^2 but for the life of me I cannot figure out how to solve this problem. Any help at all would be extremely appreciated. I have done this: F(10m)=1/2(9.8m/s2)(30m/s) F(10m)=147m/s F=14.7m/s Am I at least on the right track?