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Un article trouvé pour ce sujet.
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A spotlight shines on a wall |
2002-05-25 |
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Barb pose la question :
A spotlight on the ground shines on a wall 12m away. If a man 2m tall walks from the spotlight toward the bldg at a speed of 1.6 m/s, how fast is his shadow on the bldg decreasing when he is 4m from the bldg?
Penny Nom lui répond. |
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