my classmates and I came up with the conclusion that
It does not matter how heavt the mass is, that's tied to the end of the
string. Since both penduluns are the same lingth and are under the influence
of the same gravity (the Earth's). their swings will be identical.
p.s. the time it takes a pendulun to make one complete round tip only
depends on the string's length and the acceleration of gravity.
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