# A bus slows down uniformly from 70.4 km/h (19.6 m/s) to 0 km/h in 18 s. How far does it travel before stopping?

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I think you use the equation delta= Vit +1/2at2 but I'm not sure

The key step is to find the acceleration, which can be obtained $\Delta V=a\Delta t$.

Once you have the acceleration, you can use the equation you suggested and also the following one:

$V_f^2-V_i^2=2a\Delta x$.

Note that the acceleration is negative (slows down, or in the opposite direction from the positive x).
answered Sep 18, 2014 by (21,750 points)