Question

A kite 25 ft above the ground moves horizontally at a speed of 9 ft/s. At...

  1. A kite 25 ft above the ground moves horizontally at a speed of 9 ft/s. At what rate is the angle between the string and the horizontal decreasing when 75 ft of string has been let out?

Please show and explain work, this was previously solved but really don't know if answer looks right and I don't get what he was doing. please help

Math   Calculus   
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rad/s

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