In class 9 physics, displacement is defined as the change in position of an object and is a vector quantity with both direction and magnitude. It is represented as an arrow that points from the initial position to the final position of the object. Displacement can be positive, negative, or zero depending on the direction of the motion. The SI unit to measure displacement is meter (m) . Displacement is different from distance, which is the total movement of an object without any regard to direction. Distance is a scalar quantity that only depends on the magnitude and not the direction.