Question

A light source on the ground is positioned 10 meters away from a wall. A walker who is 2 meters long begins his race towards the wall from the light source at the speed of 1 m / s. How quickly does the length of its shadow change when the walker is 4 meters from the source?

Answer 1

Solution :

solution imis. cm rom let x be the distance b/w the spotlight (soune) and the man and a ke the length of his shadow on the building . len 1 / 2 = 2 and hency xy = 20 Take denivane on both sides of xy = 20 with respect to it. 6 y un ) + (x Dyn egyes esete) Plug in dx = 10 ,x=10-4z6 and y= 20 = 3.33 and we obtain eng - 3:33x1 =-0.555 So his Shadow is decreasing at a rare g 0.655 mis ( Ans )

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