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A 5m ladder leans against a wall. The bottom of the ladder is 2m from the...

A 5m ladder leans against a wall. The bottom of the ladder is 2m from the wall at time ?=0 sec and slides away from the wall at a rate of 0.8m/s.

Find the velocity of the top of the ladder at time ?=2 (take the direction upwards as positive).

(Use decimal notation. Give your answer to three decimal places.)

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