A simple pendulum oscillates in air with time period $T$ and amplitude $A$. As the time passes
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Time period of simple pendulum $=T$
amplitiede $=A$.
The oscillating simple pendulern experiences the ais friction due to which its amplitude gradually decreases. Also, die to air friction, the acceterdtion also decreases. So, the pendulum takes longer time to reach the rest position, which means the time period is langer.
So, $T$ increases and $A$ decreases.
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