One side of the roof of a building slopes up at 39.0°. A student throws a Frisbee onto the roof. It strikes with a speed of 15.0 m/s and does not bounce, but slides straight up the incline. The coefficient of kinetic friction between the plastic and the roof is 0.380. The Frisbee slides 10.0 m up the roof to its peak, where it goes into free-fall, following a parabolic trajectory with negligible air resistance. Determine the maximum height the Frisbee reaches above the point where it struck the roof. I think this one is the hardest question I have seen yet. In this question it says the frisbee slides 10.0m up the roof to its peek, does it mean frisbee goes up diagonally not vertically. If it goes diagonally I got the wrong answer for it. So how I can solve this problem? Also, if a frisbee strikes the roof, does a frisbee stays 15.0m/s or it was instantaneously slows down after it hits the roof?