1. A 12 foot ladder is leaning against a wall. If the top slips down the wall at a rate of 2 ft/s, how fast will the foot be moving away from the wall when the top is 10 feet above the ground?
2. A kite 50ft above the ground moves horizontally at a speed of 2 ft/s At what rate is the angle between the string and the horizontal decreasing when 200 ft of string has been let out?