there is a uniform bar or mass m and length l hinged at the centre, so that it can turn - Physics - System Of Particles And Rotational Motion

Question

there is a uniform bar or mass m and length l hinged at the
centre, so that it can turn in a vertical plane about a horizontal
axis Two point like masses m and 2m are rigidly attached to the
ends and the arrangement is released from rest Find (i) the initial
angular acceleration of the bar (ii) the initial acceleration of
mass 2m (iii) the initial reaction at hinge (iv) the angular speed
aquired by the bar as it becomes vertical

Somnath physics · Accepted Answer

Now first we evaluate the net torque due to the gravitational force The net torque will be due to the extra mass m,