John and Jane thought it was a good idea to wakeboard together, so they tie a rope between them, with John in front holding the handle. In the picture below, only John is shown. Suppose John's mass is 82.0 kg and Jane's mass is 52.0 kg. Take the coefficient of kinetic friction between the board they're standing on and the water to be 0.23. Find the strength of the applied force on John if both John and Jane have an acceleration of 4.0 m/s2 to the right. You may neglect the mass of the rope and wakeboard. Note: Use g = 9.8 m/s2