A father pulls his child on a sled by pulling on a rope over his shoulder as shown in Fig 7. The father is pulling with a force of 40.0 N at an angle of 31.0 degrees. Friction between the steel blades and the snow is 1.80 N. g Calculate the acceleration of the sled if its mass plus the child is 21.5 kg, assuming the sled is already in motion. m/s^2 V ns ry An mai our ng. F1 sol luation es for Calcu