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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