A Ferris wheel rotates clockwise and completes 1.5 rotations every second. Point B is at the edge of one of the Ferris wheel's passenger cabins and is located directly above the center of the wheel at t=0, as shown in the figure. Point B is 20 feet from the center of the Ferris wheel. The center of the Ferris wheel is positioned 50 feet above the ground. As the Ferris wheel rotates at a constant speed, the distance between B and the ground periodically decreases and increases. (B) The function h can be written in the form h(t) = asin(b(t+c))+d. Find the values of constants a,b,c,d.