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.

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Scalar Product of a diffrential.

**Physics Forums | Science Articles, Homework Help, Discussion**