What is the resultant force on an object if it is moving at a constant velocity?

When the resultant force acting on an object is zero, a moving object will continue to move at a constant velocity

FACT If moving at a constant velocity, or at rest, the resultant force is zero.

This is because resultant force=massx acceleration. Resultant force causes acceleration, not constant velocity. When velocity is constant or the object is at rest, the acceleration is zero so the resultant force is zero. Usual examples parachute/ sky diver at constant/terminal velocity or car at constant velocity.