What is the Relationship between Mass and Inerta?

I need help on my homework. or:I need help on my homework.or:Inertia is a basic property of the universe: a body tends to continue its motion in a str

I need help on my homework.

or:I need help on my homework.

or:Inertia is a basic property of the universe: a body tends to continue its motion in a straight line unless acted upon by a force. Force is defined by mass and acceleration, and inertia is not otherwise measurable.There are two ways to define mass: f=ma and w=mg. The first is mass of inertia and the second is mass of gravitation. Nobody knows any way to prove that these are or are not the same mass.Sorry for such a lousy answer. but that is all that is currently known.

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