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You are driving in Atlanta and turn a corner, heading up a steep hill. Suddenly, a small boy runs onto the street chasing a ball. You brake hard and skid to a stop, leaving a 50-foot skid mark on the street. Although the boy is unharmed, a policeman gives you a speeding ticket, citing a speed limit of 25 mph on the street.

You examine the situation:

- The street has an angle of 25° with the horizontal.
- The coefficient of static friction between your tires and the street is 0.80.
- The coefficient of kinetic friction between your tires and the street is 0.60.
- The mass of your car is 1600 kg.
- Your weight is 140 lbs.

Will you contest the ticket? Consider the physics involved in your decision.

Answer :

skid = 50 ft

Speed limit = 25 mph

angle = 25°

friction coefficient = 0.80

mass = 1600 kg

weight = 140 lbs

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