physics
posted by cool .
What should be the spring constant of a spring designed to bring a 1300 car to rest from a speed of 95 so that the occupants undergo a maximum acceleration of 6.0 ?

Vf^2=Vi+2ax
but a=F/m
0=Vi^2+2ax where a=6*9.8m/s^2
solve for x.
then, k=f/x= ma/x