A car traveling at a speed of 30.0 m/s encounters an emergency and comes to a complete stop. How much time will it take for the car to stop if it decelerates at - 4.0 m/s^2?

Question

Kendall Frye

Physics

6 September, 15:52

A car traveling at a speed of 30.0 m/s encounters an emergency and comes to a complete stop. How much time will it take for the car to stop if it decelerates at - 4.0 m/s^2?

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Answers (1)

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Jordan Ellison · Answer 1

So for this one you have vf=0 because in the end the velocity would be 0, vo or velocity initial would be 30m/s because that's the initial speed we are looking at and you have - 4.0 m/s^2 as your acceleration. You would use the formula vf=vo+at and plug those in to find your t.

So, it would be

0=30-4 (t)

-30=-4 (t)

-30/-4=t

t=7.5 seconds

The answer would be 7.5 seconds.