According to to Newton's Second Law, all the below answers are true! If an object...say a car... is sitting still and pushed with enough force to overcome static friction(friction resulting from the resting mass on a surface), then the object can accelerate from rest.
Once the car is already in motion, but not going any faster (constant velocity), there is equilibrium between the applied force and the frictional force. The car is coasting in cruise control, so there isn't any "net force". Mathematically...Net force = Force applied - Force of friction. And, if they're equal, you'd get zero.
So, what to do if you want to speed up in the car?....Press the accelerator using force. The added force of the engine will surpass the equilibrium the car will go faster. A more accurate example would be a scooter. A net force that overcomes friction and surpasses it will allow the object to accelerate. Zoom, zoom!