An object of mass $2\, kg$ is sliding with a constant velocity of $4\, m\, s^{-1}$ on a frictionless horizontal table. The force required to keep the object moving with the same velocity is (in $, N$)

An object experiences a net zero external unbalanced force. Is it possible for the object to be moving with a non-zero velocity? If yes,state the conditions that must be placed on the magnitude and direction of the velocity. If no,provide a reason.

Why is it advised to tie luggage with a rope on the roof of buses?

An athlete runs some distance before taking a long jump,because

State and explain the law of inertia (or Newton's first law of motion).

Can there be displacement of an object in the absence of any force acting on it?