A small ball is suspected from a thread. It is lifted up with an acceleration $4.9 ms^{-2}$ and lowered with an acceleration $4.9 ms^{-2}$ then the ratio of tensions in the thread in both cases will be :

Question

$\begin{array}{1 1} (1)\; 1:3 \\ (2)\; 3:1 \\ (3)\; 1:1 \\ (4)\; 1:\sqrt{5} \end{array}$