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## Homework Statement

What should be the spring constant k of a spring designed to bring a 1440 kg car to rest from a speed of 111 km/h so that the occupants undergo a maximum acceleration of 5.0 g?

____N/m

## Homework Equations

F=-kx

F=ma

V2=v(initial)2 + 2a(x)

v=v(initial) + at

## The Attempt at a Solution

a=5 x 9.8 = 49

F= 1440 x 49 = 70560

x= 30.83^2 +2(-49)x = 9.7

F/x= k =70560/9.7 = 7274.23