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A mass of 1 kg is suspended by means of a thread. The system is (i) lifted up with an acceleration of `4.9" ms"^(-2)`. (ii) lowered with an acceleration of `4.9" ms"^(-2)`. The ratio of tension in the first and second case is

A

`3 : 1`

B

`1 : 2`

C

`1 : 3`

D

`2 : 1`

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