An object of mass 2 kg is sliding with a constant velocity of 4 ms-1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is:

Given, mass m = 2 kg, velocity v = 4 ms⁻¹.
As the object is moving with a constant velocity i.e., 4 ms⁻¹.
So, the acceleration of the object is zero i.e., a = 0 and according to the property of inertia if there is no external force acting on the body, then body remains as it is i.e., if the body is at rest, remains at rest and if it is in motion, remains in motion.