A 25-ton (50,000-lb) truck coasts down a steep \(7 \%\) mountain grade without brakes, as shown in Fig. P9.72. The truck's ultimate steady-state speed, \(V\), is determined by a balance between weight, rolling resistance, and aerodynamic drag. Determine \(V\) if the rolling resistance for a truck on concrete is \(1.2 \%\) of the weight and the drag coefficient based on frontal area is 0.76.

Figure P9.72

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12 ft 100 Truck width 10 ft