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Name: Physics Challenge Question 3: Velocity and acceleration Due in class 9/29/2008 Hint for the following: Just like velocity tells us how position changes with time (slope of an x-t graph), acceleration tells us how velocity changes with time. The graphs below show the velocities (v) of two different people running, as a function of time (t). You will need no calculations for the questions below, only the graphs. But, be sure to show your work! v (m/s) v (m/s) 5 5 4 4 3 3 2 2 1 t (s) 1 2 3 4 5 6 7 8 9 10 1 t (s) 1 2 3 4 5 6 7 8 9 10 Part 1: (answer for both graphs) During which intervals of time is the acceleration positive? Negative? Part 2: (answer for both graphs) Is the acceleration ever 0? If so, when? Part 3: Which person runs farther during the first 10 seconds? (Hint: what are the units of v t )