4. Suppose you take a one hour car ride, and this is the graph of your velocity as a function of time during the trip. 80 60 40 20 10 20 40 50 60 time (minutes) (a) What is your velocity (in miles per hour) at the 50 minute mark of your trip? (b) What is the total distance (in miles) that you travel during the trip? (c) Did you travel further during the first 30 minutes or the last 30 minutes of the trip? (d) Draw a sketch of the total distance traveled (in miles) as a function of time spent on the road (in minutes) for the first half of the trip only (i.e. only for values of t with 0

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