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On a particle moving on a circular path ...

On a particle moving on a circular path with constant speed `v`, light is thrown from a projectors placed at the centre of the circular path. The shadow of the particle is formed on the wall. The velocity of shadow up the wall is

A

`vsec^2phi`

B

`vcos^2phi`

C

`vcosphi`

D

none of these

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The correct Answer is:
A
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