6) Is the solution reasonable? Problem: A 4000 kg bus descends a very steep hill at an angle of 30 degrees, at a constant speed of 20 m/s. 390 (a) In the space to the right of the bus picture (above), draw the free body diagram for this situation. Label your x and y axes. (b) Using Newton's laws, write down the two equations for the x and y components of the forces acting on the bus. Using your two equations, find the minimum coefficient of static friction s between the wheels and the road to avoid slipping. What is the force of static friction? (c) Suppose the bus driver presses the brakes too hard and the wheels start to slip. Sketch the new free body diagram for this case. If the kinetic coefficient of friction is , = 0.577 find the acceleration of the bus. This why cars now have ABS braking