A small bob 
of mass 
is attached to a massless rigid rod of length 1 m pivoted at point 
and kept at an angle of 
with vertical as shown in figure. At distance of 1 m below point 
, an identical bob 
is kept at rest on a smooth horizontal surface that extends to a circular track of radius 
as shown in figure. If bob 
just manages to complete the circular path of radius 
upto a point 
after being hit elastically by bob 
, then radius 
is 
m.
Text Solution
Verified by ExpertsA
Bob A swings from 
to vertical. Height drop 
.
Velocity of A at bottom: 
.
Elastic collision between equal masses: B gets 
, A stops.
For B to just complete circular loop: 
.
.
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