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Q. A simple pendulum is oscillating without damping. When the displacement of the bob is less than maximum, its acceleration vector $\vec{a}$ is correctly shown in

Motion in a Plane

Solution:

$a_c =$ centripetal acceleration
$a_t =$ tangential acceleration
$a_N =$ net acceleration = Resultant of $a_{c}$ and $a_{t}$,
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