Question: A light moving at 0.8 m/s approaches a man standing 4 m from a wall (Figure 10). The light is 1 m above the ground.

A light moving at 0.8 m/s approaches a man standing 4 m from a wall (Figure 10). The light is 1 m above the ground. How fast is the tip P of the man’s shadow moving when the light is 7 m from the wall?

Hodot P 4 m 1.8 m FIGURE 10 0.8 m/s 1 m

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