2 ms·
I assumed constant deceleration. Then u = sqrt(v^2 - 4as), a and s are constant so = sqrt(v^2-70^2) = approximately 70mph.
by lmm 3y ago
I assumed constant deceleration. Then u = sqrt(v^2 - 4as), a and s are constant so = sqrt(v^2-70^2) = approximately 70mph.
- FabHK 3y agoThat's the same assumption as the (first) article makes.
- lmm 3y agoIt talks about shedding energy at a constant rate per distance. Which, sure, ends up giving the same result, but it's a much weirder starting assumption, IMO.
- Ma8ee 3y agoI thought it was a quite natural assumption, considering the same brake friction force and that the work done by that is the force times the distance. (W = Fs).