A 2800-lb passenger car was originally traveling on a straight section when it gets into a section of the road with a horizontal curve of 750 ft. If the vehicle was originally travelling at 65 mph, a) determine the additional horsepower the vehicle must produce in order to maintain the original speed; b) determine the total resistance on the vehicle as it traverses the horizontal curve. The frontal cross section of the vehicle is 18.5 sq ft with a drag coefficient of 0.39.