A Kite 50 feet above the ground moves horizontally at a speed of 9 ft/sec. At what rate is the angle between the string and the ground decreasing when 140 feet of string is out? i. What is dr = ii. What is dy == dt ft/sec ft/sec iii. What is the value of when 140 feet of string is out? iv. Using the rates provided in this problem, which equation should you use to find (Choose an answer from the list below. Enter your answer as "A", "B" or "C") A.sin 0 = = B. cos 0 = C. tan 0 = 74 XNX v. At what rate is the angle changing when 140 feet of string is out? radians/second