A wooden block of mass $1 \mathrm{kg}$ and density $800\mathrm{ }\mathrm{kg} {\mathrm{m}}^{-3}$ is held stationary, with the help of a string, in a container filled with water of density $1000 \mathrm{kg} {\mathrm{m}}^{-\mathrm{3,}}$ as shown in the figure. If the container is moved upwards with an acceleration of $2 \mathrm{m} {\mathrm{s}}^{-2}$, then the tension in the string will be ( take $\mathrm{g}=10 \mathrm{m} {\mathrm{s}}^{-2}$ )