Question

how displacement can be positive negative or zero

Answer 1

Displacement is a vector quantity, which means that we need to specify a magnitude and direction. So, unlike distance, displacement cares what direction the object is going when it moves between two points. So, in one dimension, displacement can be positive, negative, or zero.

Answer 2

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Displacement is the shortest distance between the two positions of the object and it's direction is from initial to final position of the object.It is a vector quantity as it has magnitude as well as direction.So it can be zero,positive or negative.

Examples:

(i)When a body moves along a circular path and completes a revolution.In this case initial and final positions are same,so displacement(final position-initial position) is zero.

(ii)Suppose a man starts from A and travels a distance of 5km in right direction to reach B then travels 6km left to reach C.Then A to C we have negative displacement of 1km.