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A rod of mass m and length l suspended f...

A rod of mass `m` and length `l` suspended from a point swings in a vertica plane such that magnitude of acceleration of its `C.M.` at extreme points is same as that at the mean point then :

A

The deflectin angle from the vertical to the extreme position is `cos^(-1)(3//5)`

B

At the extreme position there is no centripetal acceleration of the `CM`.

C

At the mean position there is no tangential acceleration of the `CM`.

D

The angular momentum of the rod about the suspension point remains constant

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