A four wheel truck or whose operating weight is 12000 kg is pulled along a road

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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

Options:

A . 20 kg/tonne

B . 30 kg/tonne

C . 40 kg/tonne

D . 50 kg/tonne

Answer: Option C

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