1)A horizontal 810-N merry-go-round of radius 1.80 m is started from rest by a constant horizontal force of 55 N applied tangentially to the merry-go-round. Find the kinetic energy of the merry-go-round after 4.0 s. (Assume it is a solid cylinder. Also assume the force is applied at the outside edge.) 2) Use conservation of energy to determine the angular speed of the spool shown in the figure below after the 3.00-kg bucket has fallen 3.45 m, starting from rest. The light string attached to the bucket is wrapped around the spool and does not slip as it unwinds.