| r (t)| = constant implies that 1. r (t) either doesn't change with t, r '(t)=0 or 2. its...would change also by the triangle inequality. In either case since 1. r '(t)=0 or 2. r (t) dot r '(t) = r (t) r '(t)cos(90) = 0...
1 Answers · Science & Mathematics · 17/04/2015
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