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Question
16 ccc scale, proportion, and quantity if you wanted to know how long it would take you to get to the store and back, which would be more useful, average speed or average velocity? explain why.
Average speed is the total distance traveled divided by the total time taken. Average velocity is the displacement (change in position) divided by the total time. To find out how long it takes to get to the store and back, we care about the total distance covered (round - trip length). Since average speed is related to total distance and time, it is more useful. Average velocity would be zero for a round - trip (as displacement is zero when you return to the starting point), and it doesn't help in determining the time for the round - trip journey.
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Average speed is more useful because we are interested in the total distance traveled for the round - trip to calculate the time taken, and average velocity is zero for a round - trip as displacement is zero.