That if the original amplitude was A then it is now 2*A.
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The pendulum swings twice as far.
The amplitude of a pendulum is the distance between its equilibrium point and the farthest point that it reaches during each oscillation.
It messes up the math. For large amplitude swings, the simple relation that the period of a pendulum is directly proportional to the square root of the length of the pendulum (only, assuming constant gravity) no longer holds. Specifically, the period increases with increasing amplitude.
Air resistance against the bob and string and friction in the pivot make the amplitude of a simple pendulum decrease.
it doesn't