A horizontal 605 N merry-go-round of radius 1.31 m is started from rest by a constant horizontal force of 77.9 N applied tangentially to the merry-go-round. Find the kinetic energy of the merry-go- round after 3.1 s. The acceleration of gravity is 9.8 m/s2 . Assume the merry-go-round is a solid cylinder. Answer in units of J