1. The problem statement, all variables and given/known data (c) This coin is placed ﬂat on the same ramp (incline of 50.0o to the horizontal) and released from rest. How fast is the coin moving after the same distance down the ramp (30.0 cm) if the coefﬁcient of kinetic friction is 0.75? 2. Relevant equations 3. The attempt at a solution I'm not sure what is meant by the coefficient of kinetic friction.