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Q: Name a situation that would produce an average velocity of zero?

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A dog running in circles, stopping where it started

A dog running in circles, stopping where it started

A round-trip to school and back

A round-trip to school and back

Only if the velocity is constant.

To find average velocity, you need to know the displacement. If you knew displacement, average velocity would be found by: V = Displacement / time

If the velocity is constant (i.e., there is no acceleration). Terminal velocity is an example, although any constant velocity would fit this description.

No. If it its moving at constant velocity, its instantaneous velocity would be the same as its constant velocity.

In that situation, motion would be in a straight line and the speed would be increasing.

Would that be mass times velocity

For the purposes of this explanation, velocity will be given in m/s. If it's starting position is the same as its stopping position, the radio controlled car will have an average velocity of zero meters per second. This is because average velocity is displacement/time interval. Displacement is change in position and is a vector quantity, which has magnitude and direction. Average velocity is the displacement/time interval, and is also a vector quantity, including the magnitude of the speed and its direction. If you start and stop walking at the same position, your displacement is 0m, even if you walked a distance of 100 miles, and your average velocity would be 0m/s. Refer to the related link below for an illustration.

A dog running in a circle, stopping where it started, would have a net displacement of zero, an average velocity of zero, and an average acceleration of zero regardless of the time involved. This is because the dog has exerted equal work in moving toward his starting point as moving away from that point. A similar situation exists where a book is lifted from a desk and then dropped back : the book has the same potential energy as before it was lifted, the additional energy having been removed by the force of gravity.

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