A block is placed on an inclined plane moving towards right horizontally with an acceleration ${\mathrm{a}}_0=\mathrm{g}$. The length of the plane $\mathrm{AC}=1\mathrm{ }\mathrm{m}$. Friction is absent everywhere. The time taken by the block to reach from $\mathrm{C}$ to $\mathrm{A}$ is $\left(\mathrm{g}=10 \mathrm{m}/{\mathrm{s}}^2\right)$