What do you mean by work? Give an example of negative work done? What is the work to be done to increase the velocity from 18 km/hr to 19 km/hr if the mass of the care is 2000 kg.

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Work:measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement. Negative work:Work can be either positive or negative: if the force has a component in the same direction as the displacement...
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Work:measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement. Negative work:Workcan be either positive ornegative: if the force has a component in the same direction as the displacement of the object, the force is doing positivework. If the force has a component in the direction opposite to the displacement, the force doesnegative work. (Eg:Now, since the direction of Frictional force and that of displacement is opposite, hence thework done here by the Frictional force is negative.) read less
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Work:measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement. Negative work:Work can be either positive or negative: if the force has a component in the same direction as the displacement...
read more
Work:measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement. Negative work:Workcan be either positive ornegative: if the force has a component in the same direction as the displacement of the object, the force is doing positivework. If the force has a component in the direction opposite to the displacement, the force doesnegative work. (Eg:Now, since the direction of Frictional force and that of displacement is opposite, hence thework done here by the Frictional force is negative.) read less
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