A particle can slide along a track with elevated ends and a flat central part, as shown

Question:

A particle can slide along a track with elevated ends and a flat central part, as shown in Figure. The flat part has length L = 40cm. The curved portions of the track are frictionless, but for the flat part the coefficient of kinetic friction is ?_k= 0.20. The particle is released form rest at point A, which is at height h = L/2. How far from the left edge of the flat part does the particle finally stop?