Halliday, Resnick & Walker — Equilibrium and Elasticity: Problem 12

12 In Fig. 12-23, trying to get his car out of mud, a man ties one end of a rope around the front bumper and the other end tightly around a utility pole 15 m away. He then pushes sideways on the rope at its midpoint with a force of 520 N, displacing the center of the rope 0.30 m, but the car barely moves. What is the magnitude of the force on the car from the rope? (The rope stretches somewhat.)