a) The speed of car was 60 mph.
b) The speed of car was 45 mph.
Step-by-step explanation:
Given,
a = actual skid marks
p = test skid marks
Formula;
![s=30*\sqrt{\frac{a}{p}}\\](https://tex.z-dn.net/?f=s%3D30%2A%5Csqrt%7B%5Cfrac%7Ba%7D%7Bp%7D%7D%5C%5C)
a) a = 144 feet, p = 36 feet
Putting in formula;
![s = 30*\sqrt{\frac{144}{36}}\\\\s=30*\sqrt{4}\\\\s=30*2\\\\s=60](https://tex.z-dn.net/?f=s%20%3D%2030%2A%5Csqrt%7B%5Cfrac%7B144%7D%7B36%7D%7D%5C%5C%5C%5Cs%3D30%2A%5Csqrt%7B4%7D%5C%5C%5C%5Cs%3D30%2A2%5C%5C%5C%5Cs%3D60)
The speed of car was 60 mph.
b) a = 153 feet, p = 68 feet
Putting in formula;
![s=30*\sqrt{\frac{153}{68}}\\\\s=30*\sqrt{2.25}\\\\s=30*1.5\\\\s=45](https://tex.z-dn.net/?f=s%3D30%2A%5Csqrt%7B%5Cfrac%7B153%7D%7B68%7D%7D%5C%5C%5C%5Cs%3D30%2A%5Csqrt%7B2.25%7D%5C%5C%5C%5Cs%3D30%2A1.5%5C%5C%5C%5Cs%3D45)
The speed of car was 45 mph.
Keywords: substitution, speed
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