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Using the conservation laws, demonstrate...

Using the conservation laws, demonstrate that the total mechanical energy of a planet of mass m moving around the Sun along an ellipse depends only on its semi-major axis a. Find this energy as a function of a.

A

`-(GM_(s)m)/(2a)`

B

`(GM_(s)m)/(2a)`

C

`(GM_(s)m)/(3a)`

D

`-(GM_(s)m)/(3a)`

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A
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