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Like all questions in this mission, the work done by non-conservative forces must be related to the changes in energy of the object (see Know the Law section). In the case of the car skidding to a stop, the kinetic energy equation (see Formula Frenzy section) can be used to determine the initial and final kinetic energy of the car. Since the car is on the ground, the height and potential energy can be regarded as zero. The change in mechanical energy is caused by and equal to the work done upon the object. By calculating the change, the work can be determined. As mentioned in the question statement, enter a negative answer if the work is negative.
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