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A 19 ft ladder leans against a wall. The bottom of the ladder is 5 ft from the wall at time t=0 and slides away

A 19 ft ladder leans against a wall. The bottom of the ladder is 5 ft from the wall at time t=0 and slides away from the wall at a rate of 1ft/sec.

Find the velocity of the top of the ladder at time t=1.

The velocity of ladder at time t=1 is ft/sec.

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