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The first two parts are simple.

a) Ei = MgH = Ef = 1/2Mv^2 solve for v

b) Ef = 1/2Mv^2 + 2MgR = Ei solve for v

But then....

c) The best I can do for this is figure that the track should exert a force downward on the car at the top of the track. So the forces acting on the car are Fnet = mg + Ft = ma, where Ft is the force exerted by the track. If I could find a, I could find Ft. But I can't do either.

I haven't even tried part d yet.

Help, anyone?