A 5.0 × 103 kg car accelerates from rest at the top of a driveway that is sloped at an angle of 16.0? with the horizontal. An average frictional force of 4.2×103 N impedes the car's motion so that the car's speed at the bottom of the driveway is 4.9 m/s. The acceleration of gravity is 9.81 m/s2 . What is the length of the driveway?