What does it mean when an object is not a straight line? And give visual examples of accelerating objects and decelerating objects.
If the line is not straight it means that the object is changing speed. If it is an upward curve, similar to half a U, the object is accelerating as it is covering more distance in less time. If the line is an downward curve like a lower-case R, the object is accelerating, as it is covering less distance in more time.