Inside a horizontally moving box, an experimenter finds that when an object is placed on a smooth horizontal table and is released, it moves with an acceleration of $10 \mathrm{m} {\mathrm{s}}^{-2}$. In this box, if $1 \mathrm{kg}$ body is suspended with a light string, the tension in the string in equilibrium position (with respect to experimenter) will be (Take $g=10 \mathrm{m} {\mathrm{s}}^{-2}$)