A roller coaster is designed such that riders experience ''weightlessness'' as they go round the top of a hill whose radius of curvature is 20 m. The speed of the car at the top of the hill is between :
Answer & explanation
Correct answer: option 2
mg - N = \(\frac{mv^2}{r}\)
For weightlessness, N = 0
mg = \(\frac{mv^2}{r}\)
v = \(\sqrt{gr}\) = 14.140m/s