A meter stick of length 1 m is held vertically with one end in contact of the floor and is then allowed to fall. If the end touching the floor is now allowed to slip, the other end will hit the ground with a velocity of 
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In this process potential energy of the metre stick will be converted into rotational kinetic energy.
P.E. of meter stick 
Because its centre of gravity lies at the middle point of the rod.
Rotational kinetic energy 
M.I. of metre stick about point 
Angular speed of the rod while striking the ground
Velocity of end B of metre stick while striking the ground
By the law of conservation of energy,
By solving we get, 
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