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A particle slides from rest from the top...

A particle slides from rest from the top most point of a vertical circle of radius `r` along a smooth chord making an angle `theta` with the vertical. The time of descent is .

A

Least for ` theta =0^(@)`

B

Least for `theta = 45 ^(@)`

C

Least for `theta = 60^(@)`

D

Independent of `theta`

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The correct Answer is:
D
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