Above or below 30 mph at impact? tip - ke=1/2mv^2.
So I thought in terms of braking distance and really didn't have a good grasp of how that related to speed. Glad I have all those airbags.
edited to add spoiler - You would still be going faster than 70 at time of impact.
https://www.youtube.com/attribution_link?a=TEo3wXk4m7M&u=/watch?v%3Di3D7XYQExt0%26feature%3Dshare
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The force of friction is generally independent of speed. A good approximation is to assume the force of friction is constant which means the acceleration is constant until the speed reaches 0. Based on this you can calculate the time it takes to reduce the speed to 0 and then use d = 1/2 a t^2 to calculate the stopping distance.
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