Question

question 9 (1 point) michelle walks 100m toward the west, then turns and walks back the way she came 20m east. what is her displacement?
○ a 20m west
○ b 80m west
○ c 60m west
○ d 100m west

Explanation:

Step1: Define Displacement and Directions

Displacement is the net change in position. Let's take west as the positive direction and east as the negative direction.

Step2: Calculate Net Displacement

Michelle walks 100m west (so that's +100m) and then 20m east (which is -20m). The net displacement \( d \) is the sum of these two displacements: \( d = 100 - 20 \).

Step3: Compute the Result

\( 100 - 20 = 80 \) meters. Since the result is positive, the displacement is 80m west.

Answer:

b. 80m West