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A simple pendulum is vibrating with an a...

A simple pendulum is vibrating with an angular amplitude of `90^(@)` as shown in figure. For what value of `alpha` (angle between string and vertical) during its motion, the total acceleration is directed horizontally ?

A

0

B

`90^(@)`

C

`cos^(-1)((1)/(sqrt3))`

D

`sin^(-1)((1)/(sqrt3))`

Text Solution

Verified by Experts

The correct Answer is:
C
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