An ion's position vector is initially r with arrow = 7.0i hat â 7.0j + 1.0k, and 5.0 s later it is r with arrow = 7.0i hat + 7.0j â 8.0k, all in meters. what was its v with arrow avg during the 5.0 s?

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Position vector of a  particle at a given instant is given by:

On the other hand, the average velocity is the change in the particle’s position vector divided by time interval:

So we have:

Finally, the average velocity is:

the bal will not change its velocity.

a cold ice-tea.

pour in room temperature or cold water. cover the pitcher and refrigerate. steep white or green tea for 6 to 8 hours; steep black or oolong tea for 8 to 12 hours.jun 28, 2015