As the object is moving with a constant value i.e. 4ms^-1 so the acceleration of the body is zero . According to the property of inertia if there is no external force acting on the body,then the body remains as it is i.e.,if the body is at rest , remains and if it is in motion remains in motion

Explanation:

Given:
Mass of the object (m) = 2 kg
Velocity of the object (v) = 4 m/s

To understand the force required to keep the object moving with the same velocity, we need to first understand the concept of inertia and Newton's first law of motion.

Newton's First Law of Motion:
Newton's first law of motion states that an object at rest will stay at rest, and an object in motion will stay in motion with the same velocity, unless acted upon by an external force.

Inertia:
Inertia is the resistance of an object to change its state of motion. An object with a greater mass has greater inertia.

Frictionless Surface:
In this scenario, the object is sliding on a frictionless horizontal table. This means that there is no force opposing the motion of the object due to friction.

Constant Velocity:
The object is moving with a constant velocity of 4 m/s. This means that the object is not accelerating and there is no net force acting on it. The forces acting on the object are balanced.

Force Required:
Since the object is already moving with a constant velocity and there is no friction, no additional force is required to keep the object moving with the same velocity. According to Newton's first law of motion, the object will continue to move with the same velocity unless acted upon by an external force.

Therefore, the force required to keep the object moving with the same velocity is zero.

Summary:
In summary, when an object is sliding on a frictionless horizontal surface with a constant velocity, no additional force is required to keep the object moving with the same velocity. The object will continue to move with the same velocity unless acted upon by an external force, as stated by Newton's first law of motion.