fft1976@gmail.com wrote:
> On Apr 1, 8:35�pm, "fft1...@gmail.com" <fft1...@gmail.com> wrote:
>> On Apr 1, 8:10�pm, jim beam <retard-fin...@bad.example.net> wrote:
>>
>>> why would they? �can you not see the difference?
>> They were crashed into a cement wall at THE SAME SPEED, presumably.
>> But if they were crashed into each other, the effective speed would be
>> lower for F150.
>>
>> effective speed == speed relative to the center of mass of two
>> vehicles
>
> I'll try to explain this in layman's terms:
>
> If you have a 3000 lb Civic crashing into a 6000 lb Ford Pickup head-
> on, each traveling at 30 mph, then 0.1 seconds after the crash, their
> combined mess will continue going where the Ford was going, but now at
> 10 mph (preservation of momentum). Therefore, Civic decelerated 40 mph
> in the collision, and Ford only 20 mph.

give me a break!!! what matters is what happens to the occupants
acceleration vectors [deceleration] and whether the passenger cell
intrudes into their space. occupant reactions are not simple m1v1 = m2v2.