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Mike is an accident Reconstructionist. He arrives at an accident where there are 4 skid
marks of different lengths. He finds the measures to be 86 ft, 93 ft, 88 ft, and 90 ft. It is
an asphalt road with a drag factor of 0.6. Because he does not know the efficiency of the driver’s brakes, he assumes a brake efficiency of 90%. What is the minimum speed the driver could have been going?

Respuesta :

Lanuel

The minimum speed the driver could have been going is equal to 38.02 mph.

Given the following data:

  • Skid mark length = 86 ft, 93 ft, 88 ft, and 90 ft.
  • Drag factor = 0.6.
  • Brake efficiency = 90% = 0.9.

To calculate the minimum speed the driver could have been going:

How to calculate the minimum speed.

First of all, we would determine the mean of the skid marks as follows:

[tex]Mean = \frac{86+93+88+90}{4} \\\\Mean = \frac{357}{4}[/tex]

Mean = 89.25.

For the minimum speed:

[tex]Minimum\; peed = \sqrt{30 \times 89.25 \times 0.6 \times 0.9} \\\\Minimum\; peed = \sqrt{1445.85}[/tex]

Minimum speed = 38.02 mph.

Read more on skid speed here: https://brainly.com/question/23850843

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