Physics for IGCSE & O level - Forces And Motion (Section 13 - No. 7)
If an object is moving at a constant velocity, what can you say about the forces acting on it?
There is no force acting on the object.
The forces acting on the object are unbalanced.
The net force acting on the object is zero.
The object is accelerating.
Giải thích
Constant velocity means the object is not accelerating, thus the net force is zero.