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The control setup in this experiment would be one tank that does not contain any of the additives. Since the tanks with the gasoline additives would need to be compared with a tank that is not affected by the results of these additives.
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If the measurement is in joules then you can push something or pull something as long as you are moving the object. Formula: f*n force times newtons
The light coming out of a concave lens will never meet.
So, the answer is A. will never meet.
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