An object that's moving with constant speed travels once around a circular path. Which of the following statements are true concerning this motion? Select two answers.
A) The displacement is zero.
B) The average speed is zero.
C) The acceleration is zero.
D) The velocity is changing.
A) The displacement is zero.
B) The average speed is zero.
C) The acceleration is zero.
D) The velocity is changing.
Traveling once around a circular path means that the final position is the same as the initial position. Therefore, the displacement is zero. The average speed, which is total distance traveled divided by elapsed time, cannot be zero. Remember that velocity has direction and magnitude. When the object travels in a circular path the direction is always changing so the velocity is always changing. Because the velocity is changing, this means there is an acceleration that is delivered on the object.