Can the speed of a body be negative?

Give an example of a body which covers a certain distance,but its displacement is zero.

$A$ body can have zero average velocity but not zero average speed. Justify.

Ravi told his friend that his house is $1 \,km$ toward south from the main Post Office. Express the displacement and the distance moved by the friend from the Post Office when he arrives at Ravi's house. Mention the reference point chosen by you.

What can you say about the motion of an object whose distance-time graph is:
$(i)$ a straight line,parallel to the time axis?
$(ii)$ a straight line passing through the origin making an angle with the time axis?

If the displacement of a body is proportional to the square of the time elapsed,what type of motion does the body possess?