If a car is moving on a straight road with constant speed . Then
Options:
A .  work is done against force of friction
B .  net work done on car is zero
C .  net work done may be zero
D .  both (A) and (B) are correct
Answer: Option D
According to work energy theorem, net work done is given by change in kinetic energy ./ Since no change takes place in kinetic energy . Hence net work done should be zero
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