Construction Planning and Management
A four wheel truck or whose operating weight is 12000 kg is pulled along a road having a rising slope of 2% at a uniform speed. Assume grade resistance factor = 10 kg/tonne. The tension in the tow cable is 720 kg. The rolling resistance of the road will be

20 kg/tonne
30 kg/tonne
40 kg/tonne
50 kg/tonne

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