what is the average velocity of a particle when it returns to the starting point? can its average speed be zero?
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Average velocity equals to net displacement divided by total time. Here particle comes back to its original position so average velocity will be zero. However, distance can't be zero rather it will be 2pi r. And so average speed, in this case, will be equal to 2 pi r divided by time .
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Velocity is a vector, which means it has magnitude and direction. If a particle moves about and then returns to its starting point (according to some frame of reference) then this means the velocities over that time have added up to zero. But speed is not a vector. It is the scalar portion of the velocity. The average speed will have been non-zero.
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