Question

a body of mass 2kg is sliding with a constant velocity of 4m/s on a frictionless horizontal table. what is the force reguired to keep the body moving with the same velocity?

Answer 1

very nice question !!!
actually we know according to Newton's first law, every body have nature to maintain that. inertia of rest or motion untill there is no net force applied on that body.

so, here body moves with same velocity untill there is no net force applied on that body.

hence,net force applied on the body = 0
hence, no force require to keep the body moving with the same velocity.