m A r M. /3
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Consider the Earth in an elliptical orbit around the Sun. The Sun's and Earth's masses are M and m, respectively. The Earth has a distance r from the Sun and a speed v as it passes past point A in its orbit. The distance between the Earth and the Sun is r/3 when it passes past point B.
(1) (a)When the Earth passes by point B, what is its speed?
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