Question $2$: You push a $2\mathrm{.}0kg$ block against a horizontal spring, compressing the spring by $15cm.$ Then you release the block, and spring sends it sliding across a tabletop. It stops $75cm$ from where you released it$.$ The spring constant is $200\frac{N}{m}.$ What is the block$-$table coefficient of kinetic fr ction? $(g-9\mathrm{.}8\frac{m}{s^2})$