a rod of length L is hinged from one end. It is brought to a horizontal position and released. The angular velocity of the rod when it is in vertical position is

a) sqrt(sg/l)

b) sgrt(3g/l)

c) sqrt (g/2l)

d) sqrt(g/l)

hi sharma,

                 u consider motion of center of mass of rod.

 it has come down by L/2 height.intially rod was at rest.

                                incriment in grav.P.e=gain in K.E

                            mgl/2=   1/2 x (ml2)/3 x w2

solving u gt b as ans

Approved