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Answer :
Final answer:
To calculate a vehicle's speed at the time of an accident, information such as the length of skid marks, type of pavement, and the condition of the pavement (wet or dry) is required, as they affect the friction and the calculation of initial speed. Option d is the correct answer.
Explanation:
To determine the speed of a vehicle in an accident, it is necessary to have multiple pieces of information. The essential data includes the length of the skid marks (L), the type of pavement, and whether the conditions were wet or dry. This is because these variables affect the coefficient of friction between the tires and the pavement, which is crucial for calculating the speed at the beginning of the skid.
The basic physics principle applied here is that the work done by the friction force during the skid is equal to the kinetic energy the vehicle had before starting to skid. This relationship can be used to express the initial speed (v) in terms of skid mark length and other relevant variables, using the formula derived from the work-energy principle.
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