Neco 2021 Physics Question 47
Practice objective / multiple choice question 47 from the 2021 Neco Physics examination.
A speed\-time graph for a car shows the following: from \(t=0\) s to \(t=5\) s the speed increases uniformly from \(0\) to \(20\) m/s; from \(t=5\) s to \(t=15\) s the speed remains constant at \(20\) m/s; from \(t=15\) s to \(t=20\) s the speed decreases uniformly to \(0\) m/s. The car has a mass of \(1500\) kg. Its engine works at an efficiency of \(30\%\) and the energy content of fuel is \(3.6\times10^{7}\) J per litre. Assuming the engine's only mechanical work is to change the car's kinetic energy, what is the minimum volume of fuel (in litres, to three significant figures) consumed during the 20\-second interval?
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About This Question
This is Neco 2021 Physics Question 47. It is one of the objective questions from the 2021 Neco Physics examination.
Difficulty level: Hard .
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