A car's engine with 45 N to the right. If it is at equilibrium, how much air friction is there and what is the car's acceleration?
A) Air friction: 45 N, Acceleration: 0 m/s²
B) Air friction: 0 N, Acceleration: 45 m/s²
C) Air friction: 45 N, Acceleration: 45 m/s²
D) Air friction: 0 N, Acceleration: 0 m/s²