When can we be certain that the average velocity of an object is always equal to its instantaneous velocity?
A) always
B) never
C) only when the velocity is constant
D) only when the acceleration is constant
E) only when the acceleration is changing at a constant rate

Question

Quizplus · Accepted Answer

The average velocity of an object is equal to its instantaneous velocity only when the velocity is constant. When the object's velocity is changing, the instantaneous velocity can be different at different times, making it different from the average velocity. Therefore, we can be certain that the average velocity is always equal to the instantaneous velocity only when the velocity is constant.

When Can We Be Certain That the Average Velocity of an Object