A-LevelMathematicsMechanicsOct/Nov 2018Paper 4 Q35 Marks
A van of mass 2500kg descends a hill of length 0.4 km inclined at 4° to the horizontal. There is a constant resistance to motion of 600 N and the speed of the van increases from 20 m s⁻¹ to 30 m s⁻¹ as it descends the hill. Find the work done by the van's engine as it descends the hill.
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