An electrician is working at the top of a ladder that is 18 ft long and leaning against the wall when its bottom starts sliding at arate of 1 ft/s. Fortunately, a fellow worker catches it when the ladder's bottom is 6 ft from the wall. At what speed is the topof the ladder (along with the electrician) sliding down the wall at that instant? Round any intermediate calculations, ifneeded, to no less than six decimal places, and round your final answer to two decimal places.
