Physics - SHM Question with Solution | TestHub

Comprehension (Figure 5.126): A small block of mass $m$ is fixed at the upper end of a massless vertical spring of constant $K=\frac{4mg}{L}$ and natural length $10L$. The lower end of the spring is free and at height $L$ above a fixed horizontal floor. The spring is unstressed and the system is released from rest. As the block is coming down, the maximum speed attained by the block is: