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(B) According to Newton's first law of motion,an object moving with uniform velocity has zero net force acting on it. On a rough horizontal road,the c

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$A$ force is surely being applied by its engine

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(B) According to Newton's first law of motion,an object moving with uniform velocity has zero net force acting on it. On a rough horizontal road,the car experiences a resistive frictional force $(f_k)$ acting in the direction opposite to its motion. To maintain a uniform velocity (i.e.,zero acceleration),the engine must apply a forward force $(F)$ that exactly balances this frictional force. Therefore,$F_{net} = F - f_k = 0$,which implies $F = f_k$. Thus,a force is surely being applied by the engine to overcome the friction.

$A$ car is moving with uniform velocity on a rough horizontal road. Therefore,according to Newton's first law of motion,

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