Question

The net force on a car traveling at a constant speed in a straight line is zero. In which of these would the net force remain zero?
A. The car speeds up to pass a big truck.

B. The car gets a flat tire and slows down.

C) In an instant the car comes to a complete stop.

D) The driver swerves around a piece of iron in the road.

Answer 1

I believe the answer is In an instant the car comes to a complete stop. 

The net force is calculated through:
F = m x a
m = mass
a = Acceleration

When the car came into a complete stop, the acceleration become 0

Which means that


F = m x a

F = m x 0

F= 0