A light moving at 0.8 m/s approaches a man standing 4 m from a wall (Figure 11). The
Chapter 3, Problem 123(choose chapter or problem)
A light moving at 0.8 m/s approaches a man standing 4 m from a wall (Figure 11). The light is 1 m above the ground. How fast is the tip P of the mans shadow moving when the light is 7 m from the wall?
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