Thank you for reporting, we will resolve it shortly
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 $a_{t}$,