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Q.

How can you lower a 100 kg body from the roof of a house using a cord with a breaking strength of 80 kg weight without breaking the rope? (1 kg weight = g N)

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a

9.8 m/s2 downwards

b

1.96 m/s2 downwards

c

19.6 m/s2 downwards

d

4.9 m/s2 downwards

answer is A.

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Detailed Solution

Mg-T=Ma

a=Mg-TM=1009.8-80(9.8)100=1.96ms-2

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