# College physics

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According to test performed by the manufactures, an automobile with an initial speed of 75 km/h has a stopping distance of 25 m on a level road. assuming that no skidding occurs during breaking, what is the value of μ , between the wheels and the road required to achieve the stopping distance?

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you help me solve this problem. but how am i suppose to if i don't know the mass of the car?
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