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A mass 1 kg is suspended by a thread. It is (i) lifted up with an acceleration 4.9 m/s2(ii) lowered with an acceleration 4.9m/s2. The ratio of the tensions is

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a

3 : 1

b

1 : 3

c

1 : 2

d

2 : 1

answer is A.

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Detailed Solution

T1=m(g+a)=1×g+g2=3g2 T2=m(g−a)=1×g−g2=g2∴T1T2=31

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