The Fig. 73 below shows the schematic of an automobile having a mass of \(900 \mathrm{~kg}\) and the suspension spring constant of \(81 \times 40^{4} \mathrm{~N} / \mathrm{m}\). If it travels at a speed of \(72 \mathrm{~km} / \mathrm{hr}\) on a rough road with periodic waviness as shown, what is the forcing frequency of the road on the wheel?

(a) \(10 \mathrm{HZ}\)

(b) \(4 \mathrm{HZ}\)

(c) \(1.5 \mathrm{~Hz}\)

(d) \(20 \mathrm{HZ}\).

Transcribed Image Text:

5m 3cm Fig.73