Ball surface equations

Question 1

equation for t roll

Answer 1

t roll = X0 - aw / g(ukcos0 - sin 0) + a^2/k^2 ukgcos0

Question 2

U crit equation

Answer 2

U crit = 1/Uy(1+e) * (I(aw-Ux)/Icm + ma^2)