To maintain a speed of 80 km/h by a bus of mass 500 kg on a plane rough road for 4 km distance, the work done by the engine of the bus will be ______ kJ. (The coefficient of friction between tyre of bus and road is 0.04.) [2023]

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Solution

Q.
To maintain a speed of 80 km/h by a bus of mass 500 kg on a plane rough road for 4 km distance, the work done by the engine of the bus will be ______ kJ. (The coefficient of friction between tyre of bus and road is 0.04.) [2023]

Ans.
(784)

$For constant speed, W D by engine + W D by friction = 0 [by WET]$

$W D_{engine} = - W D_{friction} = - [- μ m g x]$

$= 0.04 \times 500 \times 9.8 \times 4 \times 10^{3} = 784 kJ$

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