Answer
See work.
Work Step by Step
There are 4 forces acting on the car:
1. the force of friction from the road, acting uphill parallel to the hill. This is the force that pushes it up the hill.
2. the force of air resistance acting opposite to that.
3. the normal force from the road, acting perpendicular to the hill.
4. its weight, i.e., the force of gravity, acting straight downward.
These forces sum to zero because the car moves at constant velocity.
