sharon sprinter changes her speed from 4.5m/s to 7.5m/s in the middle 1.5 seconds of a 100m race. what is her average velocity for this time period?
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That is just not true! If you can calculate its average speed you should be able to calculate its speed at any point in time during its flight, including its final velocity.
velocity is a vector and speed is scalar. Velocity has magnitude and directions, with magnitude being speed. The magnitude of average velocity and average speed is the same.
Their average speed is the harmonic mean of 30 and 45 while their average velocity is zero.
I think it is cuz speed is velocity it's just a vector (more difficult name)
total velocity * * * * * It is the average speed, not velocity which is a vector.