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A runner, beginning at rest, completed a 50 m run with a final speed of 6 m/s. Assuming constant acceleration.
a) What was the average speed of the runner?
b) What was the runner's time?
c) What was the acceleration?

a) half the final speed
b) distance/(average speed)
c) (final speed)/(elapsed tme)
= (final speed/([distance/average speed)]
=(final speed)^2/[2*(distance)]

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