A Ferris wheel with a radius of 13 m is rotating at a rate of one revolution every 2 minutes. How fast is a rider rising when the rider is 18 m above ground level?

Answer 1

y = 13+13sin(πt)
solve for t when y=18
then get dy/dt = 13πcos(πt)

There are other sin/cos functions you can use, but they will all produce the same result.