A small ball is suspended 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

( A ) 1 : 3
( B ) 3 : 1
( C ) 1 : 1
( D ) 1 : $\sqrt 5$