Question

What is the galileo's law of inertia?

Answer 1

The law of inertia states that:

A body will preserve its velocity and direction so long as no external force acts on it.

For example : a package thrown out of an airplane will continue to move at the speed of the airplane on the horizontal axis (in the direction of the airplane's movement). Since the law of gravity acts on the package (a vertical downward axis), the package will gather speed along the vertical axis, but on the horizontal axis its speed will remain equal to that of the airplane.

(In this explanation we have left out the force of air-resistance).