Question

Why displacement is -3 in question no 2

Answer 1

the downward direction is taken as negative direction, thus the displacement is negative.Since, distance has no direction i.e., it's a scalar quantity it's positive.As it doesn't depend on direction.Here downward direction is taken as negative.

Answer 2

It is negative because it defines a change in position of an object while carefully monitoring its direction. Then you walk back towards your original location in the opposite direction.