# phyics

Suppose a runner completes one lap around a 400-m track in a time of 50 s. Calculate the average velocity of the runner.

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1. zero
distance = 400
displacement = 0
(came back to the same spot)

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2. and if you are Rachel, that is a very different question from the earlier one.

speed = distance/time
velocity = displacement /time

for speed you need a speedometer
for velocity you need a speedometer and a compass

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3. 0/400

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4. 8m/s

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5. sq

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