Engineering
Physics
SHM of Simple Pendulum
Basics of Simple Harmonic Motion
Circular Motion in Vertical Plane
Question

A simple pendulum is oscillating without damping when the displacement of bob is less than maximum, its acceleration vector a is correctly shown in : 

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Solution
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ahas two components
(i)  ar= radial acceleration and 
(ii) at = tangential acceleration
Option (3) is correct.