$A$ body of mass $500 \, g$ is at rest on a frictionless surface. Calculate the distance travelled by it in $10 \, s$ when acted upon by a force of $10^{-2} \, N$. (in $, m$)

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 velocity. If no, provide a reason.

Two balls of the same size but of different materials,rubber and iron,are kept on the smooth floor of a moving train. The brakes are applied suddenly to stop the train. Will the balls start rolling? If so,in which direction? Will they move with the same speed? Give reasons for your answer.

When balanced forces act on a body,the body is

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

In which direction do the following forces act when an object is in motion?
$(i)$ Frictional force
$(ii)$ Gravitational force
$(iii)$ Centripetal force