Hey, in my text book they keep doing this and I can't follow(adsbygoogle = window.adsbygoogle || []).push({});

for example r.[tex]\ddot{}r[/tex] = 1/2 [tex]\ddot{}r^{}^2{}[/tex]

and r.[tex]\dot{}r[/tex] = 1/2 [tex]\dot{}r^2{}[/tex].

Can anyone explain this to me? I know I should probably know it.

P.S Can't quite get the dot product to look right apologies.

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# Scalar Product of a diffrential.

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