Block A starts from rest and slides 8m down a frictionless 30 degree angled inclined plane. It then crosses a 4m horizontal surface where the coefficient of kinetic friction is 0.2. What is the velocity of Block A after it has finished crossing the horizontal surface?
(Note: It hits a ball at the end of a string after that and you have to find the height Ball B goes to, but I know how to do that If I can figure out the end velocity of Block A after it has crossed the horizontal surface).
Fnet = ma?
Ff = uFn
The Attempt at a Solution
I am fairly sure that Block A is going 19.81m/s as it starts onto the horizontal surface but am not sure how to calculate the end velocity after crossing the frictional surface.