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A 2 m ladder leans against a vertical wa...

A `2 m` ladder leans against a vertical wall. If the top of the ladder begins to slide down the wall at the rate `25cm//sec.`, then the rate `("in cm"//"sec".)` at which the bottom of the ladder slides away from the wall on the horizontal ground when the top of the ladder is `1 m` above the ground is :

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