A toy car is pulled forward by a string with a force of 30N. The frictional force acting on it is 18N opposite to the motion. In which direction will the car accelerate?
a) Backward, because friction dominates and produces a net force opposite to the pull
b) Forward, because the net unbalanced force of 12N is in the forward direction
c) It will not accelerate; the applied and frictional forces cancel each other
d) It will move forward with constant speed since, due to inertia, an object in motion keeps moving without further force