Q 1723491341.     A bob of mass m is suspended by a C
light string of length L. It is
imparted a horizontal velocity `v_0`
at the lowest point A such that it
completes a semi-circular
trajectory in the vertical plane
with the string becoming slack
only on reaching the topmost
point, `C`. This is shown in figure
A pendulum bob is suspended from a rigid support
by means of a light string of length 1 m. The bob is
pulled aside from its equilibrium position till the
string makes an angle of `30^0` with the vertical and
then released. With what speed does the bob cross
its equilibrium position? (`g = 10 m// s^ 2`).