A 2,199-kg car is moving up a road with a slope (grade) of 29% while slowing down at a rate of 2.1 m/s^2. What is the direction and magnitude of the frictional force? A 1,967-kg car is moving up a road with a slope (grade) of 11% while slowing down at a rate of 3.3 m/s^2. What is the direction and magnitude of the frictional force? (define positive in the forward direction, i.e., up the slope)? A 2,160-kg car is moving up a road with a slope (grade) of 40% while speeding up at a rate of 2.8 m/s^2. What is the direction and magnitude of the frictional force? (define positive in the forward direction, i.e., up the slope)?