_J \\ 1, The top of a 13 foot ladder, leaning against a vertical wall, is slipping down the wall at the rate of4 feet per second. How fast is the bottom of the ladder sliding along the ground when the bottom of the ladder is 9 feet away from the base of the wall? (Round your answer to four decimal places. Be sure to choose the correct units.) J -Select-~ leesecond seconds/foot Submit Answ '9" g , second 5