a cabin is moving upwards with a const acceleration g. A boy standing in the cabin wants to whirl a particle of mass m in a vertical circle of radius l.(mass is attached to an ideal string).Caculate minimum velocity which should be provided at lower most point(w.r.t cabin)so that particle can just complete the circle.

Dear Debashish,

Since the cabin  is accelerated with a acceleration g thats why it becomes the same case as that of gravity free problem.

Best Of luck

Plz Approve the answer...!!!!

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