Oh for part c, i got now after using the conservation of energy. I made a mistake while solving it before, which led me to not have Vb and theta only.
Part a, I got it too now, since only 90 degrees would allow it to be the same height, but since the angle in the picture doesn't show 90 degrees...
1. Homework Statement
A toy car coasts along he curved track shown above. The car has initial speed vA when it is at point A at the top of the track, and the car leaves the track at point B with speed vB at an angle ϴ above the horizontal. Assume that the energy losses due to friction is...