What can you say about the motion of an object if it's speed--time graph is a straight line parallel to the time axis

Q.

What can you say about the motion of an object if its speed−time graph is a straight line parallel to the time axis?

Q. Question 3
What can you say about the motion of an object if its speed-time graph is a straight line parallel to the time axis?

Q. What can you say about the motion of an object whose distance time graph is a straight line parallel to the time axis?

Q. What can you say about the nature of motion of a body if its displacement-time graph is a straight line parallel to time axis ?

Q.

What can you say about the nature of motion of a body if its displacement-time graph is

(a) a straight line parallel to time axis?

(b) a straight line inclined to the time axis with an acute angle?

(c) a straight line inclined to the time axis with an obtuse angle?

(d) a curve?