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one end of a 10 m long ladder is on the ground and the ladder is supported part way along its length by resting on

one end of a 10 m long ladder is on the ground and the ladder is supported part way along its length by resting on top of a 3 m high fence. When the bottom of the ladder is 4 m from the base of the fence and is being dragged along the ground away from the fence at a rate of 1/5 m/s, how fast is the free top of the ladder moving vertically?

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