Please answer directly to the point.

1. In what instance, if any, the speed and velocity, and distance and displacement means the same?

2. In what instance, if any, the equations of motions under constant acceleration can't be used?

3. Strictly speaking, including the vector nature of acceleration, cite three instances where a body can be accelerated.

4. In straight-line motion (SLM), in what instance, if any, the acceleration of an object is zero.

5. In SLM using the origin of the rectangular coordinate system (or the x-y coordinate system) as the reference point for describing motion,

explain what is means when we have

A.) negative velocity, negative displacement x, and negative acceleration and

B.) positive velocity, positive displacement x, and positive acceleration.