A farmer hitches her tractor to a sled loaded with firewood and pulls it a distance of 27 m along level ground. The total weight of sled and load is

12,000 N. The tractor exerts a constant 6000-N force at an angle of 35.0° above the horizontal. There is a 3500 N friction force opposing the sled's motion. Which free-body diagram corresponds to the description of the problem?