Posted by Sarah on Wednesday, June 3, 2009 at 12:33pm.
speed=distanceran/time
velocity=(final position-initialposition)/time
I assume you know the distance around a circle (PI*diameter).
what do you mean by final position - initial position
The final - initial positions in part b are on opposite sides of the circle. For distance run, you went half way around the track. (pi D/2)
For distance between beginning point and end point you do not go around the track, you draw a vector straight across from start to finish, thus just the diameter.(D)
In part a, your average velocity was ZERO, because your final position is the same as your initial position and you went nowhere. Of course your speed was pi D/62.5
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