Two persons are holding a rope of negligible weight tightly at its ends so that it is horizontal. A 15 kg weight is attached to the rope at the mid point which now no longer remains horizontal. The minimum tension required to completely straighten the rope is:
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a
15 kg
b
15/2 kg
c
5 kg
d
infinitely large
answer is D.
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Detailed Solution
A horizontal force cannot balance a vertical force so minimum tension is infinitely large.