What must be the shortest possible time for the lifting of this body?

A body of mass M, initially at rest, is erected by a rope of negligible mass up to a height H, where it is again at rest. Consider that the greatest traction the string can hold has a modulus equal to nMg, where n> 1. What must be the shortest possible time for the lifting of this body?

√[nH/2(n-1)²g] √[4nH/(n-2)g] √[2H/(n-1)g] √[2nH/(n-1)g]

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