Application of DerivativeHard

Question

A kite is 300 m high and there are 500 m of cord out. If the wind moves the kite horizontally at the rate of 5 km/hr. directly away from the person who is flying it, find the rate at which the cord is being paid?

Options

A.4
B.8
C.3
D.cannot be determined

Solution


From figure z2 = x2 + y2
z
If z = 500 then x = 400
⇒  500 = 400(5)
⇒  = 4

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