When do the distance and magnitude of displacement become equal?

in which of the following cases of motion, the distance covered and magnitude of displacement can be same?

A person moves on a semicircular track of radius 40 m. If he starts at one end of the track and reaches the other end, find the distance covered and magnitude of displacement of the person.

In which situation, distance and magnitude of displacement are same?

A cyclist travels 5km in the east direction. Then he travels 12km in the south direction. What is the magnitude of displacement of the cyclist ?

Assertion: The distance and displacment both are equal when the particle moves in a straight line. Reason: In straight line motion distance travelled= Idisplacement I.

If the distance covered is zero, the displacement:-

Explain with an example that the magnitude of displacement may be zero but the corresponding path length is not zero.

A wheel of 1 m radius completes half rotation on horizontal path. Magnitude of displacement form the point of contact with path initially is………