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# s1a10 - Physics E-1a Homework Assignment#1 Solutions Fall...

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Physics E-1a Homework Assignment #1 Solutions Fall 2010 MC 2. The answer is d) If the car is heading east and slowing down so the positive acceleration must be in the opposite direction or westward. MC 3. The answer is a) The magnitude of the average velocity is the change in displacement divided by the elapsed time. X f ! X i " t = 0 " t = 0 MC 4. The answer is b) The average speed is the total distance traveled divided by the elapsed time. total distance ! t = 2 ! y ! t MC 17. The answers are b) velocity does not change with time, a) velocity increases with time at a constant rate (linear), d) velocity decreases with time at a constant rate (linear), c) velocity increases with time but at varying rates (non linear). 20. Strategy The slope of each segment (between changes in the slope) of the graph is equal to the speed during that time period. Solution Find the speed during each time period. Then, plot x v as a function of time. 4 m 0 1 s: 4 m s 1 s x t v < < = = 6 m 4 m 1 3 s: 1 m s 3 s 1 s x t v !

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s1a10 - Physics E-1a Homework Assignment#1 Solutions Fall...

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