The next question is how do we calculate the mass of each object?
The simplest solution is to monitor the position of all the masses involved at regular intervals and to use Newton's Law. See previous reflection.
The final question is: The mass calculated in this way is this the gravitational mass or the inertial mass?
IMO the difference does not make much sense. Instead of a person jumping from a building you can also drop an iron ball from the building and the same way as the person you can calculate the masses of all the objects involved.
Using that iron ball as a yardstick and with a balance you can calculate the mass of any object you want.
A final remark: What happens in case the iron ball (you drop) has the same mass as the Earth? You have to take that effect into account.
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