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Re:Police Say Uber Is Likely Not at Fault for Self-Driving C... by Balgair on Tuesday March 20, 2018 @12:50PM (#16630282)
For the people that practice street-math, Kinetic Energy goes as (velocity)^2. So halving the speed reduces the energy to 1/4. A third of the speed is 1/9th the energy. etc.

As you go faster, your energy goes up exponentially. This is why there are bitter fights about increasing the speed limit on roads; they become exponentially less safe (big caveats apply, naturally).

Re:Police Say Uber Is Likely Not at Fault for Self-Driving C... by rripken on Tuesday March 20, 2018 @01:06PM (#16630448)
So if you are going 10% faster (38 vs 35) you have 121% the kinetic energy.
Re:Police Say Uber Is Likely Not at Fault for Self-Driving C... by Balgair on Tuesday March 20, 2018 @02:19PM (#16631115)
My math says it's ~1.18 times more KE.

But yes, about 1/5th more KE with just a 3 mph difference.