**Explanation:**

To understand why the correct answer is option 'D' (0 N), let's analyze the forces acting on the object:

1. **Weight:** The weight of the object is the force due to gravity acting vertically downwards. It can be calculated using the equation: Weight = mass x gravitational acceleration. In this case, the weight would be 2 kg x 9.8 m/s^2 = 19.6 N.

2. **Normal force:** The normal force is the force exerted by a surface to support the weight of an object resting on it. When an object is on a horizontal table, the normal force is equal in magnitude but opposite in direction to the weight of the object. So, the normal force in this case would also be 19.6 N.

3. **Frictional force:** The frictional force acts in the opposite direction to the motion of the object. It can be calculated using the equation: Frictional force = coefficient of friction x normal force. However, since the object is sliding with a constant velocity, we can conclude that the frictional force is equal in magnitude but opposite in direction to the force applied to keep the object moving with the same velocity. Therefore, the frictional force in this case is 0 N.

Now, let's consider the forces in the horizontal direction:

- Since the object is sliding with a constant velocity, the net force acting on it must be zero. This means that the force required to keep the object moving with the same velocity must be equal in magnitude but opposite in direction to the frictional force.
- As mentioned earlier, the frictional force is 0 N in this case, so the force required to keep the object moving with the same velocity is also 0 N.
- Hence, the correct answer is option 'D' (0 N).

Overall, the object is able to maintain a constant velocity of 4 m/s on the frictional horizontal table without any external force acting on it.

Correct answer is 0 N

Because since the object of mass 2kg is sliding on a frictionless horizontal table, thus no friction force is applied on it.

According to newton's 1st law of motion, an object at a uniform motion in straight line will continue performing uniform motion in straight line unless compelled by an external force....

Since no friction is there, so it will continue moving in straight line performing uniform motion....

And thus, ''NO FORCE IS REQUIRED TO KEEP THE OBJECT MOVING WITH THE SAME VELOCITY''

Because if any force is applied, the object will 'ACCELERATE'

HOPE YOU FIND MY ANSWER HELPFUL