Hi there!
So, I believe an <em>isobar</em> connects areas of the same atmospheric pressure, and an <em>isotherm</em> connects areas of the same temperature. Hope this helped :)
The answer is 0m because at point 8s the displacement is at zero m for example at 3s the displacement is at 8m
Larger. How big depends on the size of the vector. But think about pythagoras theorem to solve for the vector.
