A string tied on a roof can bear a maximum tension of $50 \mathrm{kg} \mathrm{wt}.$ The minimum acceleration that can be acquired by a man of $98 \mathrm{kg}$ to descend will be $\left[\mathrm{Take} \mathrm{g}=9.8 \mathrm{m} {\mathrm{s}}^{-2}\right]$

In the figure given below, with what acceleration does the block of mass $m$ will move? (Pulley and strings are massless and frictionless)

$T_1$ and $T_2$ in the given figure are

In the arrangement shown, the mass $m$ will ascend with an acceleration (Pulley and rope are massless)