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One end of an elastic cord is attached t...

One end of an elastic cord is attached to a block of mass m and the other end is held keeping the cord relaxed and vertical.Relaxed length of the cord is l and there is a mark P at a height 0.8l from the lower end.If the upper end is slowly raised,the block leaves the ground,when the mark P reaches the point where the upper end of the relaxed cord initially was.The work done by the force applied by the hand is `(mgl)/(n)` Find 'n' value

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