What is the acceleration of the sled and the normal force acting on it, to the nearest tenth? a = 1.3 m/s2; fn = 63.1 n a = 1.6 m/s2; fn = 65.6 n a = 1.9 m/s2; fn = 93.7 n a = 2.2 m/s2; fn = 78.4 n