Erika walks 62.9 m north, then 145 m south. What is the magnitude of her resultant displacement?

Answer 1

Ok she walks some distance north, turns around and comes south. Displacement is the net distance traveled so:

d = 62.9 m - 145 m = - 82.1 m

The magnitude is the absolute value of the displacement or 82.1 m

Answer 2

145 - 62.9 = 82.1 m to the south, from the origin..