Posted by **ibob** on Friday, May 1, 2009 at 6:17pm.

The position function of a spaceship is below and the coordinates of a space station are (8, 5, 11). The captain wants the spaceship to coast into the space station. When should the engines be turned off?

r(t) = (5+t)i + (3+ln(t))j + (9 - 4/(t^2) +1

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