Merry-go-rounds are a common ride in park playgrounds. The ride is a horizontal disk that rotates about a vertical axis at their center. A rider sits at the outer edge of the disk and holds onto a metal bar while someone pushes on the ride to make it rotate. Suppose that a typical time for one rotation is 5.0 s and the diameter of the ride is 14 ft. Part A For this typical time, what is the speed of the rider, in m/s? Express your answer in meters per second. Vi AEd ? U = m/s Submit Request AnswerPart B What is the rider's radial acceleration, in m/s-? Express your answer in meters per second squared. ? arad = m/s2 Submit Request Answer Part C What is the rider's radial acceleration if the time for one rotation is halved? Express your answer in meters per second squared. O ? arad = m/$2 Submit Request