An accident investigator measures the skid marks of one of the vehicles involved in an accident. The length of the skid marks was 84 feet. What is the speed of the vehicle before the brakes were applied?

A. The speed cannot be determined from the length of skid marks alone.
B. 30 mph
C. 40 mph
D. 50 mph

Question

10-09-2024
Physics

High School

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An accident investigator measures the skid marks of one of the vehicles involved in an accident. The length of the skid marks was 84 feet. What is the speed of the vehicle before the brakes were applied?

A. The speed cannot be determined from the length of skid marks alone.
B. 30 mph
C. 40 mph
D. 50 mph

Answer :

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akshaya133se akshaya133se · Answer 1 · 2024-04-05T12:50:27-04:00

Final answer:

The length of skidmarks alone is insufficient to determine the speed of a vehicle before the brakes were applied, as additional information like the coefficient of friction is necessary for such calculations.

Explanation:

To determine the speed of a vehicle before the brakes were applied based solely on the length of skidmarks requires additional information such as the coefficient of friction between the tires and the road and the mass of the vehicle. Accident investigators typically use the conservation of momentum and the work-energy theorem to determine pre-collision speeds. Without this additional data, it is not possible to calculate the speed of the vehicle accurately.

In the scenario you provided from Brainly, where you had a coefficient of friction and a skidmark length, an accident investigator can calculate the initial speed. However, in the question you asked, since we do not have the coefficient of friction or any other necessary data, the answer would be A. The speed cannot be determined from the length of skidmarks alone.