A car of mass 1000 kg is traveling at a constant 25.0 m/sec along a straight, level highway. There is a force of thrust acting on it in the forward direction (the direction the car is moving) of 3000 N. There are drag forces and forces of rolling friction opposing the motion of the car (acting in the direction against its motion). The rolling friction is 600 N. What is the magnitude of the drag force?
so acceleration is zero. figure then dragposted by bobpursley