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a car is moving with a constant velocity of 30km/h on a rough road ,what will be the magnetude & direction of net force acting on the car
The net force needed is zero. Force is mass x acceleration and acceleration suggests a change in velocity. For constant speed and direction, the acceleration is zero, and hence the net force is zero. When moving at constant velocity, the frictional and drag forces (which work to slow the car) and the drive force of the engine are exactly equal and opposite. The net force is the sum of these two opposite forces, and hence the net force is zero.


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