hi all

please help me

A point object of mass m is connected to an inertialess string of length L. The other end of which is fixed to a point O. At time t = 0, the object is assumed to begin to move horizontally in a vertical plane from the bottom point A (OA = L) in the clockwise direction with an initial speed Vo. If $\displaystyle \sqrt{2gL}$ < Vo < $\displaystyle \sqrt{5gL}$(g=acceleration due to gravity), then at a point B the magnitude of the force acting on the object from the string becomes zero, where OB = L and the velocity of the object is perpendicular to OB. We restrict ourselves to the case 0 < $\displaystyle \theta$< $\displaystyle \pi$/2. From the point B, for a while, the object takes a parabolic orbit till a point C, where OC = L. In the case

$\displaystyle \theta$ =

$\displaystyle \pi$/3, find the angle

$\displaystyle \varphi$
I've found the speed V =

and the initial speed Vo =

. I also got the maximum elevation (with respect to the location B) =

What should i do next?

thx