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    the strings are mass-less and inextensible?

    A bob of mass m , suspended by a string of length l1 is given a minimum velocity required to complete a full circle in the vertical plane. At the highest point, it collides elastically with another bob of mass m suspended by a string of length l2, which is initially at rest.If the second bob, after collision acquires the minimum speed required to complete a full circle in the vertical plane, the ratio l1/l2 is.

    Asked By Dalveer Singh


    • The initial speed of 1st bob (suspended by a string of length l1)is
      The speed of this bob at highest point will be
      When this bob collides with the other bob there speeds will be interchanged.

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