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We want to find the spring constant for the spring in
each wheel. Its relationship to other known quantities is
. Since each spring in the car is supporting a quarter
of the total car weight, we have . The angular frequency has
the value

which gives a value of 129 kN/m.
Next, we're going to add an amount of 573.0 kg to the total
weight. Then each spring supports 1/4 of this new total weight and,
since the spring constant doesn't change when the weight changes, we
have

Dan Cross
2006-10-18