d(adsbygoogle = window.adsbygoogle || []).push({}); ^{2}A/dt^{2}=0

or

dA/dt=k=rv/2

L=rxp

L/m=rxv

L/(2m)=(rxv)/2

How does dA/dt relate toL?

In a certain book, it says dA/dt=H/2 where H=L/m=rv

butLis a vector and H is not.

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# Kepler's 2nd Law

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