So probably about 1.4 seconds, a normal modern car probably 10-20% on top of thatI think you have entirely missread what Ive actually wrote. Your formula is for calculating the average deceleration rate, not the time. You absolutely suck at maths, you've started with the wrong formula but you've still completely f ked it up. So probably about 1.4 seconds, a normal modern car probably 10-20% on top of that It works out at a roughtly 10m/s^2 deceleration which is very heavy breaking.Ĭan't be bother to do the actual maths but if i remember correctly it works out at just under 3 seconds from 60 with that sort of deceleration rate, which is the sort of rate you would got on a very high performance car Your formula is for calculating the average deceleration rate, not the time.Īn 8 year old could figure out you've gone wrong if you work out stopping from 13m/s in 8m is clearly not a deceleration of 0.77 m/s per second God Im bored.You absolutely suck at maths, you've started with the wrong formula but you've still completely f ked it up. So if you slow down by more than 1.722mph per second according to CanAms numbers you will be "emergency braking". Same with accelerating - sometimes full bore is done for fun, other times it's getting out of the way of something (again, hopefully vanishingly rarely).Īs an engineer i refuse to use ft/sec xD! You can of course plan a near enough full force stop, racing/particularly hot track day driving etc. Lots and lots of those would be quite mild emergencies (numpty pulls out into a gap not quite big enough etc), with hopefully a very few being full-force stops. It's not a 'normal road speed' but it's something, and interesting nonetheless.Įdit: there's not really a strict definition of what constitutes 'emergency braking' rather than normal braking, but I'd say if the braking was otherwise unintended then it's an emergency. The limiting factor here would be tyres, working on the rule of thumb principle that pretty much every car can lock its brakes.Ġ-100-0 is a relatively common test, as is 0-100 times, so using that you could deduce the braking time from 100-0. Just a thought, if you're looking to search for this them metres per second per second would be the standard unit for acceleration, which in this case would be negative.
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