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AL2006
Newton's 2nd law of motion is:  Force= (mass) x (acceleration).

Divide each side by 'acceleration' and you have:  Mass = (force) / (acceleration).

-- At any point on the graph, read off the force and the acceleration.
-- Divide the force by the acceleration.
-- The quotient is the mass.

It should be constant, unless the moving object is something like a rocket,
which is constantly burning fuel and reducing its mass.

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