Question

Suppose an object is turning around so that it undergoes a change in velocity from –2 m/s to +2 m/s. Is its velocity becoming more positive or less positive than it was before? What is meant by more positive? Less positive? Is it undergoing an acceleration while it is turning around? How do you know?

Answer 1

Initially it had -2m/s velocity then the velocity changes direction, so it becomes more and more positive. More positive means that once the velocity and acceleration attains same direction the magnitude of velocity increases in the same direction. Yes, it undergoes a positive acceleration while turning around,since the initial velocity was negative and acceleration was positive the velocity becomes zero and eventually achieves positive direction.