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A ladder is 2m long has lower end on the...

A ladder is `2m` long has lower end on the ground and the other end in contact with a vertical wall. The lower end slips along the ground. If upper end is moving downward at the rate of `25cm//sec` and whn upper end of ladder is `1m` above the ground, then the rate at which lower end ot the ladder is sliding on the ground is

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