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A particle starts travelling on a circle...

A particle starts travelling on a circle with constant tangential acceleration. The angle between velocity vector and acceleration vector, at the moment when particle completes half the circular track. Is

A

`tan^(-1)(2pi)`

B

`tan^(-1)(pi)`

C

`tan^(-1)(3pi)`

D

`tan^(-1)(2)`

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The correct Answer is:
A
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