A 5m long ladder has its upper end leaning against a vertical wall and lower end on a perfectly level ground. The lower end moves away at a constant rate of 3cm/sec. How fast is the upper end of the ladder moving down, in cm/sec when the lower end is 3m from the wall? Answer should be within these givens: 2.25 cm/sec 0.25 cm/sec -2.25 cm/sec 0.25 cm/sec

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