A 20 foot ladder is resting against the wall.  The bottom of the ladder is initially 14 feet from the bottom of the wall.  It is being pushed up the wall at a rate of 1 3 ft/sec.  How fast is the top of the ladder moving up the wall after 6 seconds? a.  Draw and label a diagram. b.  Show all of the work done. c.  State the answer in a complete sentence using standard written English.