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To give a 18-{rm kg} child a ride, two teenagers pull on a 3.6-{rm kg} sled with ropes, as indicated in the figure . Both teenagers pull with a force of 55 {rm N} at an angle of 35 ^circ relative to the forward direction, which is the direction of motion. In addition, the snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 {rm N}. Find the acceleration of the sled and child.

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