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A man 2m tall is watching a street light 6m high as he jogs toward it at a rate of 2m/s. How fast is the angle of elevation of the man's line of
sight increasing at the instant that he is 3m from the base of light?
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Draw a little diagram, with the dude, the light, and label the heights. Now get the triangle in there, with leg lengths a=4 (the difference between the man and the light), and b=3 (the...
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The units of dA/dt would be rad/s.
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