question archive Question 2) A spotlight on the ground shines on the wall 12m away

Question 2) A spotlight on the ground shines on the wall 12m away

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Question 2) A spotlight on the ground shines on the wall 12m away. If a man 2m tall walks from the spotlight toward the building at a speed of 1.6m / s, how fast is the length of his shadow on the building decreasing when he is 4m from the building?

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