70. REASONINGThe only horizontal force acting on the boat and trailer is the tension in the hitch; therefore, it is the net force. According to Newton’s second law, the tension (or the net force) equals the mass times the acceleration. The mass is known, and the acceleration can be found by applying an appropriate equation of kinematics from Chapter 3. SOLUTION Assume that the boat and trailer are moving in the +xdirection. Newton’s second law is xxFmaΣ=(see Equation 4.2a), where the net force is just the tension +Tin the hitch, so x
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