Q21
Q21. A particle of mass m attached to the end of string of length l is released from the initial position A as shown in the figure. The particle moves in a vertical circular path about O. When it is vertically below O, the string makes contact with nail N placed directly below O at distance h and rotates around it. If the particle just complete the vertical circle about N, then
(A) h =3l5 (B) h =2l5 (C) h =l5 (D) h =4l5
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Answered by
28
Apply law of conservation of energy at the initial point and at the below the nail where it must have a velocity of √5gr to complete circle.
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Answered by
27
Answer:
just see the uploaded photo
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