To give a 19kg child a ride, two teenagers pull on a 3.7 kg sled with ropes, as indicated in the figure. Both teenagers pull with a force of 55N at an angle of 35 degrees relative to the forward direction, which is the direction of motion. In addition, the snow exerts a re t a r d i n g force on the sled that points opposite to the direction of motion, and has a magnitude of 57N, find the acceleration of the sled with the child.