Answer to Question #4490 in Differential Equations for kennedy
"A woman 6ft tall walks away from a light 10ft above the ground. If her shadow lenghtens at the rate of 2ft/sec, how fast is she walking?"
v-velocity of woman
We have from first triangle (x+vt)/10=vt/6
From the second one (x+vt+L)/10=L/6
From first : x=(2/3)vt
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