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How deep is my well - Colegiul National C. Negruzzi (Iași - Roumanie)

Titre du sujet: 
How deep is my well
This exercise is about the fall of a stone in a well with an outer edge of 1 meter, the depth of which is measured the ground level. We hear the splash after exactly 2.4 seconds. Thus, we need to find the depth of the well in various situations.
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Sujet | by Dr. Radut