\[ \mathbf{r}(t) = (2t^2 -1) \mathbf{i} + (t^3 +1) \mathbf{j} \] Calcular: a) El vector posición inicial. b) La distancia al observador (distancia al origen del sistema de referencia) a los 5 segundos. c) El espacio recorrido a los 3 segundos.
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