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Nov 2015 p41 q3
3447
A lorry of mass 24,000 kg is travelling up a hill which is inclined at 3° to the horizontal. The power developed by the lorry’s engine is constant, and there is a constant resistance to motion of 3200 N.
- When the speed of the lorry is 25 m s-1, its acceleration is 0.2 m s-2. Find the power developed by the lorry’s engine.
- Find the steady speed at which the lorry moves up the hill if the power is 500 kW and the resistance remains 3200 N.
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