Question

A 2 kilogram object is moving horizontally with a speed of 4m/s. How much net force is required to keep the object moving at this speed and in the direction?

Answer 1

IF there is no friction against the moving object (impossible in real life),
then it takes NO force to keep the object moving at a constant speed
in a straight line.

It takes force only to CHANGE the object's motion ... speed it up, slow
it down, or change its direction.