A body of mass 
is hung on a 
long string. The body is pulled by hand till it makes an angle 
with the vertical and then pushed at an initial velocity 
in a downward direction, perpendicular to the string. The weight moves in a circular arc, as shown in the figure below. Air resistance is ignored.
Calculate the height from which the body is pushed.
What is the speed at which the body travels through the lowest position?
What is the maximum height reached by the body after the push?
Weight on a string
