The loaded trailer has a mass of 800 kg with center of mass at G and is attached at A to a rear-bumper hitch. If the car and trailer reach a velocity of 48 km/h on a level road in a distance of 39 m from rest with constant acceleration, compute the vertical component Ay of the force supported by the hitch at A. The vertical force Ay is positive if up, negative if down. Neglect the small friction force exerted on the relatively light wheels.