Physics - Gravitation Question with Solution | TestHub

A small ball of mass ' m ' is released at a height ' R ' above the earth surface, as shown in the figure above. If the maximum depth of the ball to which it goes is $\mathrm{R}/2$ inside the earth through a narrow groove before coming to rest momentarily. The groove, contain an ideal spring of spring constant $K$ and natural length $R$, find the value of $K$ if $R$ is radius of earth and $M$ mass of earth