13. The string of a kite is perfectly taut and always makes an angle of 35 above horizontal (Fig. 18). (a) If the kite flyer has let out 500

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13. The string of a kite is perfectly taut and always makesan angle of 35" above horizontal (Fig. 18).(a) If the kite flyer has let out 500 feet of string, how high is the kite? (b) If the string is let out at a rate of 10 feet per second, how fast is the kite's height increasing?