No.The displacement-time graph of a moving body can not be a straight line
perpendicular to the time axis. A graph like that would indicate that the body
moved with infinite speed, moved from one place to another in zero time, or
occupied many different places at the same time. Considerable evidence has
piled up which suggests that none of those things can happen.
A straight line with a positive slope on a position-time graph is the graph of an object that's moving in a straight line with constant speed.
A straight slanted slope on a velocity-time graph indicates that the object is moving with a constant acceleration.
It means that the object in question is moving at a constant speed.If the graph is a straight horizontal line, then the speed is zero.
If a body is moving with variable speed, then the only thing you can say aboutits speed/time graph is that the graph is not a straight, horizontal line.
Straight line
A graph of uniform velocity would be a straight line with a constant slope, indicating that the object is moving at a constant speed in a straight line without changing its velocity.
The displacement-time graph for a body moving in a straight line with uniformly increasing speed would be a straight line with a positive slope. As time increases, the displacement of the body also increases at a constant rate.
The straight horizontal line on the graph says: "Whatever time you look at, the speed is always the same". This is the graph of an object moving with constant speed.
The shape of the displacement-time graph for uniform motion is a straight line with a constant slope. This indicates that the object is moving at a constant speed in a straight line.
A velocity-time graph is often a misnomer since it is, in almost all cases, a graph showing the component of velocity in the direction towards and away from a fixed point of reference. The graphs do not usually included any information on the motion in a perpendicular direction. Therefore, a straight line in a "velocity"-time graph indicates that there is no acceleration in the radial direction.
An Upward Sloping Straight Line. <3
That depends on what you have chosen for the axes. If one of the axes is enthalpy, then an adiabatic line would be a straight line perpendicular to that axis.