Spring mass system is shown in figure. Find the elastic potential energy stored in each spring when block is at its mean position. Also find the time period of vertical oscillations. The system is in vertical plane.

Answer

`(M^(2)g^(2))/(2k), (M^(2)g^(2))/(4k)` and `(M^(2)g^(2))/(6k)` from above, time period `= 2pisqrt((11m)/(6k))`