Solución

v(t)=etietj,a(t)=eti+etj,v(t)=e2t+e2t\bold{v}(t) =e^t\bold{i}-e^t\bold{j}, \bold{a}(t)= e^t\bold{i}+e^t\bold{j},\\ \|\bold{v}(t)\|=\sqrt{e^{2t}+e^{-2t}}