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Копия The rate of change of a shadow

Yazar:Методисты ЛИОТ и ЛТСО, Mark Willis, Doug Kuhlmann
A man running from a street lamp.
A street lamp is 8m high. A man of height 1.6m walks along the street away from the lamp at a steady rate of 1 m/s. At what rate is the length of his shadow changing?

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