“A skier starts from rest at the top of a hill. The skier coasts down the hill and up a second hill, as shown. The crest of the second hill is circular, with a radius of r = 36m. neglect friction and air resistance. What must be the height h of the first hill so that the skier just loses contact with the snow at the crest of the second hill?”
p.s. you will automatically feel like you have Beautiful Mind after watching 16 minutes of someone doing equations on glass with the video rotated horizontally. Sick technique: simple, effective, smart.