Final Answer:
Sally's displacement has a magnitude of 5 meters.
Step-by-step explanation:
We can treat Sally's movements as changes in coordinates on a two-dimensional plane, with "up" being positive on the y-axis and "left" being negative on the x-axis. Therefore, her movement can be represented as a vector with components (3 meters, -4 meters).
To find the magnitude of this displacement vector, we use the Pythagorean theorem:
Magnitude = √(3^2 + (-4)^2)
= √(9 + 16)
= √25
= 5 meters
Therefore, the total distance Sally moved regardless of direction, which is her displacement, is 5 meters.