How to weigh a flatlander in 2D gravity?

Newton who laid out a set of mathematical rules to predict the motion of objects from a falling apple to planets orbiting the Sun, however it was Einstein who described how two masses tend to accelerate towards each other; he formulated the general relativity.

Flatland is a story written by Edwin Abbott showing the amazing and bizarre world in which there are creatures living in a world with only two spatial dimensions and one time dimension, it is considered a beautiful masterpiece even today.

My world borrows element from Flatland and I need everything in this world to obey Newton's law of universal gravitation, my concern is how can the flatlanders measure gravitational mass?

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How to weigh a flatlander in 2D gravity?

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