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A car is moving in a circular horizontal...

A car is moving in a circular horizontal track of radius 10 m with a constant speed of `10 ms^(-1)` . A plumb bob is suspended from the roof of the car by a light rigid rod. The angle made by the rod with the vertical is:

A

`0^(@)`

B

`(pi)/(3)`

C

`(pi)/(6)`

D

`(pi)/(4)`

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