Question

how can you test experimentally inertia depends upon it's mass

Answer 1

Inertia is directly proportional to mass of the body

The more the inertia, the more the mass

Answer 2

Hey mate!!!

For example- If we take a boulder and a football.
We try kicking the boulder it won't move because of its high inertia but when we kick a football it will move along it way.
thus we can say the boulder resists change in state due to its high inertia. We also know the mass of the boulder is higher than that of the football. Thus we come to the conclusion that the interia of a body depends on its mass.

Hope this helps!