Question

when is displacement (1) zero (2) equal to distance

Answer 1

Ans.
1. when any objects or organisms starts from a fixed point and again come at the same point , then in that situation ,the displacement of the object and organisms become zero.
FOR Eg. the movement of a bicycle once in a ground.
2. When an objects or organisms moves in a straight line from one point to another point, then the distance travelled by object and organisms is equal to the displacement.
FOR Eg.,
the movement of vehicles on a straight road from one point to another point.
This is your answer.☺️

Answer 2

When the initial and final positions of the object are the same point, then net displacement is zero regardless of the actual distance travelled.

On the other hand, when the object travels in a totally straight path then the net displacement must be equal to the distance.