Not actually a response.

Let's take a portion of newton's first law

> an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced external force.

Does it prove it's truth? No. Can it? No. Even if I throw a rock at your head and it hits you and falls to the ground, it doesn't prove the postulate, because the idea that your head is denser than a rock and therefore provided sufficient force to stop the rock is actually just presumed even when measured in real time.

I want to be clear. The reason the rock stopped is presumed. The density of your Mongoloid skull is a fact.