Question

what u will consider it ( uniform or non uniform motin ) if a stone drop on the ground from the altitude of 100km ///////////explain/////// brainlisted question

Answer 1

it is a non uniform motion as it's acceleration will be equal to 10m/s

Answer 2

It's a non uniform motion.
Non uniform motion is the one in which the momentum of the body is not constant, aka its velocity is not constant, due to some force which is externally exterted on it.

Now, in this scenario, the ball, when released(not forcefully) will have zero speed of its own and will fall due to earth's gravitational force, with an acceleration of 9.8 meter per second per second. So, after two second, the ball's speed(magnitude of velocity, since its falling vertical) will increase again by 9.8 m/s, thus becoming 19.6m/s and so forth, adding 9.8 to its speed per second, till it hits the ground. Since there is a change in its velocity, its motion is not constant, I.e. non uniform