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# help me plz

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A runner whose initial speed is 29km/h increases her speed to 31km/h in order to win a race. If the runner takes 5.0s to complete this increase in her speed, what is her accelration

jordanh  Oct 25, 2017
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Average velocity = $$a$$ =$$\frac{{x}_{f} - {x}_{i}} {{t}_{f} - {t}_{i}}$$

Where:

$${x}_{f}$$= Final position

$${x}_{i}$$= Initial position

$${t}_{f}$$= Final time

$${t}_{i}$$= Initial time

Acceleration = $$\frac{Velocity}{Time}$$

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That is what I can do for sure, but I am not able to solve that right now. Maybe you can figure the answer out yourself with these formulas?

Mr.Owl  Oct 25, 2017