Physics - Center of Mass Question with Solution | TestHub

A ball of mass m is released in a circular tube of radius R. A spring of spring constant K which is in its natural length is placed in the tube as shown in figure. If angle made by radius vector of the ball with vertical when ball comes at an instantaneous rest is$60^{\circ }$, then the value of K is $\frac{(6mg)\lambda }{{\pi }^{2}R}$. Then find the value of $\lambda$ :