Question

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
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Answer 1

Answer:

Correct option is (2) At the top of a hill the riders experience weightlessness. It means that the centrifugal force acting on the roller coaster must have a magnitude equal to that of mg , which is it's weight. So balancing these forces we get, v²/R = g Here, R = 20m solving for v, we get v = 14.14 m/s Which lies in between 14m/s and 15m/s

Explanation:

Answer 2

Answer:

14.5

Explanation:

ok.....ok.....................................................