To maintain a speed of 80 km h -1 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]
Text Solution
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(784)
It is given,
v = 80 km h -1
m = 500 kg
S = 4 km
= 0. 04
The power due to friction is
P f = Fv where F = 
mg
Hence, the work done by the engine in overcoming the friction is
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