A small ball of mass m attached at the midpoint of a tightly stretched elastic cord of length l can slide on a horizontal plane. The ball is given a small displacement in a direction perpendicular to the cord and released. Assuming the tension T in the cord to remain constant,
(a) write the differential equation of motion of
![1914_669ba5fe-db38-48ea-90d9-1d571390276c.png](https://secure.tutorsglobe.com/CMSImages/1914_669ba5fe-db38-48ea-90d9-1d571390276c.png)