If you walked 8m north and then 3m south your displacement is

Displacement = 8.54m

Explanation:

Let n = North direction

Let s = South direction

Resultant displacement, R =?

Displacement can be defined as the change in the position of a body or an object. It is a vector quantity because it has both magnitude and direction.

Given the following data;

n = 8m

s = 3m

The magnitude of displacement or resultant displacement is given by the formula below;

R² = n² + s²

R² = 8² + 3²

R² = 64 + 9

R² = 73

Taking the square root, we have;

R = 8.54m

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.