A body freely falls from a certain height onto the ground in a time ‘t’. During the first one third of the interval it gains a kinetic energy $∆{\mathrm{K}}_1$ and during the last one third of the interval, it gains a kinetic energy $∆{\mathrm{K}}_2$. The ratio $∆{\mathrm{K}}_1 : ∆{\mathrm{K}}_2$ is