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A mass 1 kg is suspended by a thread. It...

A mass 1 kg is suspended by a thread. It is
(i) lifted up with an acceleration `4.9m//s^(2)`
(ii) lowered with an acceleration `4.9m//s^(2)`.
The ratio of the tensions is

A

`1 : 3`

B

`3 : 1`

C

`1 : 1`

D

`1 : sqrt(5)`

Text Solution

Verified by Experts

The correct Answer is:
B
`T_(1)- mg = ma" "mg-T_(2)= ma`
`T_(1)=m(g+a)" "T_(2)=m(g-a)`
`T_(1)/T_(2)=(g+a)/(g-a)=14.7/4.9=3/1`
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