Final answer:
The displacement of an object is the vector difference between its final and initial position, which includes both magnitude and direction, and its SI unit is the meter.
Step-by-step explanation:
The displacement of an object refers to the change in its position, considering both the magnitude and direction, making it a vector quantity. In physics, displacement highlights how far out of place an object is; it's the object's overall change in position. For instance, if a car's initial position is given as i and its final position is f, the displacement is the vector difference (f - i).
Displacement also implies that an object has not only moved but has been shifted in a particular direction relative to a reference frame. This could be described in various scenarios, such as a professor moving to the right of a whiteboard or a passenger moving toward the rear of an airplane.
The SI unit for displacement is the meter. When discussing total displacement, it is the sum of individual displacements over a period, which can be more complex if the object's path is not straight.