(a) The force on the spring for each wheel of the given car is 6,000 N.
(b) The compression of each spring when the car rest on the ground is 15 cm.
The given parameters;
The force on the spring for each wheel of the given car is calculated as follows;
[tex]F = F_1 = F_2 = F_3 = F_4 = \frac{W}{4} \\\\F= \frac{24,000}{4} \\\\F = 6,000 \ N[/tex]
The compression of each spring when the car rest on the ground is calculated as;
[tex]F= kx\\\\x = \frac{F}{k} \\\\x = \frac{6,000}{400} \\\\x = 15 \ cm[/tex]
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