In an automobile drag race, the rear (drive) wheels of a

Chapter 13, Problem 13.51

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In an automobile drag race, the rear (drive) wheels of a l000-kg car skid for the first 20 m and roll with sliding impending during the remaining 380 m. The front wheels of the car are just off the ground for the first 20 m, and for the remainder of the race 80 percent of the weight is on the rear wheels. Knowing that the coefficients of friction are \(m_{s} = 0.90\) and \(m_{k} = 0.68\), determine the power developed by the car at the drive wheels (a) at the end of the 20-m portion of the race, (b) at the end of the race. Give your answer in kW and in hp. Ignore the effect of air resistance and rolling friction.