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A kite is moving horizontally at a heigh...

A kite is moving horizontally at a height of 151.5 meters. If the speed of kite is 10 m/s, how fast is the string being let out , when the kite is 250 m away from the boy who is flying the kite ? The height of boy is 1.5 m.

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`(dy)/(dt)=8`
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KUMAR PRAKASHAN-APPLICATION OF DERIVATIVES -SOLUTIONS OF NCERT EXEMPLAR PROBLEMS (SHORT ANSWER TYPE QUESTIONS)
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  12. Find the condition that the curves 2x=y^(2) and 2xy = k intersect orth...

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  13. Show that the curves xy=a^(2) and x^(2)+y^(2)=2a^(2) touch each other.

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  14. Find the co-ordinates of the point on the curve sqrt(x)+sqrt(y)=4 at w...

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  15. Find the angle of intersection of the curves y = 4-x^(2) and y=x^(2).

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  16. Prove that the curves y^(2)=4x and x^(2)+y^(2)-6x+1=0 touch each other...

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  19. Show that a point at which the line (x)/(a)+(y)/(b)=1 touches to the c...

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  20. Show that f(x)=2x+cot^(-1)x+log(sqrt(1+x^(2))-x) is increasing in R.

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