I think its d. but im not sure
You have done something incorrectly. such as your data.
Have everything in control and in order and discuss about different issues.
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50N is your force and the acceleration is -9.8m/s^2 due to gravity.
So, you just plug that in.

BUT you know that mass cannot be negative, so you just disregard the negative sign and the mass of the rock is 5.102 grams.
The planet that is the farthest is Neptune, pls make me brainliest:)