[tex] F_{cf} [/tex]=G+N
N=0⇒[tex] F_{cf} [/tex]=G
[tex] F_{cf} [/tex]=m*ω^2*r=(v/r)2*r=m*v^2/r
m*v^2/r=m*g
[tex] E_{A} [/tex]=[tex] E_{B} [/tex]
[tex] E_{pA} [/tex]=[tex] E_{Bp} [/tex]+[tex] E_{BC} [/tex]
m*g*h=m*g*2r+(m*v^2)/2
v^2=2g*h-4r*g (1)
v^2=r*g (2)
din (1) si(2)⇒r*g=2*g*h-4*r*g⇒h=(r+4r)/2⇒h=5r/2
