A wooden block of mass 5 kg rests on a soft horizontal floor. When an iron cylinder of mass 25 kg is placed on the top of the block, the floor yields…

A wooden block of mass $\displaystyle 5$ kg rests on a soft horizontal floor. When an iron cylinder of mass $\displaystyle 25$ kg is placed on the top of the block, the floor yields and the block and the cylinder together go down with an acceleration of $\displaystyle 0.1 \mathrm{~ms}^{-2}$. The action force of the system on the floor is equal to: