Understanding the Concepts
* Newton's First Law: An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
* Constant Velocity: This means the object is moving at a steady speed in a straight line.
* Friction: A force that opposes motion between surfaces in contact.
Applying the Concepts
To maintain constant velocity, the net force acting on the object must be zero. This means the forces acting on the object must balance each other out.
Since we have friction opposing the motion (25 N), we need an equal and opposite force to counter it.
Therefore, the force needed to maintain constant velocity is 25 N in the direction opposite to the friction force.
