A sports car is accelerating up a hill that rises 18.0° above the horizontal.
The coefficient of static friction between the wheels and the road is µs = 0.89.

It is the static frictional force that propels the car forward.

(a) What is the magnitude of the maximum acceleration that the car can have?
in m/s^2

(b) What is the magnitude of the maximum acceleration if the car is being driven down the hill?
in m/s^2