ENGINEERING The upper ends of the vertical coil springs in the stock race car can be moved up and down by means of a screw mechanism not shown. This adjustment permits a change in the downward force at each wheel as an optimum handling setup is sought. Initially, scales indicate the normal forces to be 800 lb, 800 lb, 1000 lb, and 1000 lb at A, B, C, and D, respectively. If the top of the right rear spring at A is lowered so that the scale at A reads an additional 100 lb, determine the corresponding changes in the normal forces at B, C, and D. Neglect the effects of the small attitude changes (pitch and roll angles) caused by the spring adjustment. The front wheels are the same distance apart as the rear wheels.