The figure shows a mass m = 5 kg sliding down a frictionless surface from an initial height h at point P. The mass slides down the surface and around a frictionless loop of radlus R = 2 m. If the mormal force that the surface exerts on the mass when it is at the position Q is given by FN = 180 N, what is the height h? (A) 4.1 m (B) 7.2 m (C) 2.5 m (D) 3.8 m (E) 5.7 m
