1.

particle of mass m attached to the end of stringoflength , is released from the horizontal position.The particle rotates in a circle about O as shown.When itcontact with a nail N placed directly below 0 at adistance h and rotates around it. For the particleto swing completely around the nail in a circle,28is vertically below O, the string makes29(2) hèc(3) h(4) he/

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