A stone is thrown vertically upward. When the stone is at point A, its distance from a certain point O is (OA=6) and the component of velocity along OA is nonzero. When it is at point B(OB= 10 m), the velocity at B is zero. When it is at point C(OC=6 m), the component of velocity of the particle along OC is zero. If the velocity of projection of the stone is v0 = 5 n ms-1, then the value of n is __________
From figure,
The maximum height attained by the ball is
H=AB=12 m+8 m = 20 m