6. (a) Since the problem gives the frequency f = 3.00 Hz, we have ω = 2 π f = 6 π rad/s (understood to be valid to three significant figures). Each spring is considered to support one fourth of the mass m car so that Eq. 15-12 leads to () ( ) 2 5 car 1 1450kg 6 rad/s 1.29 10 N/m.
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