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 4.0 s and the diameter of the ride is 10 ft. A. For this typical time, what is the speed of the rider in m/s?B. What is the rider's radial acceleration, in m/s?C. What is the rider's radial acceleration if the time for one rotation is halved?