# A girl of height 120 cm is walking towards a light on the ground at a speed of 0.6 m/s. Her shadow is being cast on a wall behind her that is 5 m from the light. How is the size of her shadow changing when she is 1.5 m from the light?

Let the Height of the girl's shadow on the wall be

and the distance the girl is from the light be

We are asked for

We are given

and using the diagram below we can determine

When

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When the girl is 1.5 m from the light, her shadow size decreases. This is because she is closer to the light source, causing her shadow to become smaller in proportion to her height.

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