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How do I calculate final velocity of a planet moving around a star? The things I know are the positions of star/planet initial V of the planet, the masses of the objects. We are also given the time steps or delta t. I have successfully calculated the force, impulse, initial, and final momentum. I am stuck on the Final velocity of the planet after the force of the sun has acted on it. Could someone point me in the right direction? :)

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