Homework 2-solutions - Version 028 Homework 2 Helleloid...

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Unformatted text preview: Version 028 Homework 2 Helleloid (58250) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points The position of a car as a function of time is given by the values in table t (seconds) 1 2 3 4 5 s (feet) 13 17 33 39 57 Find the average velocity for the time period beginning when t = 3 and lasting 2 seconds. 1. average vel. = 10 feet/sec 2. average vel. = 9 feet/sec 3. average vel. = 12 feet/sec correct 4. average vel. = 8 feet/sec 5. average vel. = 11 feet/sec Explanation: Average velocity between times t = 3 and t = 3 + h is given by dist. travelled time taken = s (3 + h ) s (3) h . When h = 2, therefore, s (3 + 2) s (3) 2 = s (5) s (3) 2 = 57 33 2 . Consequently, over the time interval from t = 3 to t = 5 the car has average velocity = 12 ft/sec . 002 10.0 points A car is driven at decreasing speed. Sketch a graph of the position of the car as a function of time. 1. time position 2. time position 3. time position 4. time position Version 028 Homework 2 Helleloid (58250) 2 5. time position correct 6. time position Explanation: When the position of the car is plotted against time, the slope of the graph indicates the speed of the car, the greater the slope, the greater the speed, and the car is stationary when the slope is zero. Thus of the graphs, only time position has the given properties. 003 10.0 points The point P (1 , 7 6 ) lies on the graph of the function f defined by f ( x ) = 7 x 4 + 2 x ....
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This note was uploaded on 12/04/2009 for the course M 408k taught by Professor Schultz during the Fall '08 term at University of Texas at Austin.

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Homework 2-solutions - Version 028 Homework 2 Helleloid...

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