1. gf 2. g 3. weight of 2kg object 4. mass of 2kg object on a planet with double mass of earth and half the radius of earth

It is either a  proton or a neutron im almost positive. hope this .

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Um idk im just doing this for points so just ask google or something

Repeated trials allow you to calculate a mean which can reduce the effect of random errors to make your results more precise.your results will also be reproducible therefore if someone else did the same experiment they'd get the same results which would make your results more reliable.