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A simple pendulum is set up in a trolley...

A simple pendulum is set up in a trolley which is moving with an acceleration a on a horizontal palne. Then, the thread of the pendulum in the mean position makes an angle with the vertical equal to

A

`tan^(-1) (a//g)` in the forward direction

B

`tan^(-1) (a//g)` in the backward direction

C

`tan^(-1) (g//a)` in the forward direction

D

`tan^(-1) (g//a)` in the backward direction

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