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Q.

A kite is 15 mts height and 20 mts of string are out. If the kite starts drifting away horizontally at the speed of 4 m/hr. Then how fast is string being released.

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a

2m/hr

b

7 m/hr

c

4m/hr

d

5 m/hr

answer is C.

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Detailed Solution

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y2=x2+225 2ydydt=2xdxdt 20×dydt=57×4         dydt=7

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