- #1
skittlez411
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Homework Statement
A 1200 kg car rolling on a horizontal surface has speed v=65km/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 2.2m. what is the spring stiffness constant of the spring?
Homework Equations
K(final)+Us(final)=K(initial)+Us(initial)
1/2mv^2 + 1/2k(delta x)^2= 1/2mv^2 + 1/2k(delta x)^2
The Attempt at a Solution
1/2(1200)(0) + 1/2k(2.2)^2 = 1/2(1200)(18.06) + 1/2k(0)^2
k = 80867.00826 N/m
The answer looks so big that it doesn't make sense to me. I converted the 65km/h to m/s.
thanks,
nicole!