A trailer truck enters a 2 percent uphill grade traveling at 66 km/h and reaches a speed of 108 km/h in 300 m. The cab has a mass of 1800 kg and the trailer 5400 kg. Determine the average force at the wheels of the cab. The average force at the wheels of the cab is: kN. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.