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Unformatted text preview: white (taw933) HW07 ben-zvi (55600) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 2) 10.0 points It took Anna from noon until 3 p.m. to drive from UT to her home 90 miles from Austin. After t hours of driving her distance from Austin was given in miles by s ( t ) = 30 t 2- 20 3 t 3 . (i) What was her average speed for the trip home? 1. average speed = 29 mph 2. average speed = 30 mph 3. average speed = 31 mph 4. average speed = 32 mph 5. average speed = 28 mph 002 (part 2 of 2) 10.0 points (ii) Her instantaneous speed twice coincided with her average speed. At what time did it first happen? 1. at 12:37 pm 2. at 12:47 pm 3. at 12:42 pm 4. at 2:21 pm 5. at 2:31 pm 003 10.0 points A storm system is in the Central Texas area and moving in a straight line through Austin. The Weather Service Office forecasts that t hours after 12noon the the storm will be a distance of s ( t ) = 24 + 2 t- t 2 miles from Austin. How fast will the storm be moving at 4:00 pm and in what direction will it be moving? 1. storm speed = 8 mph, storm moving towards Austin. 2. storm speed = 6 mph, storm moving away from Austin....
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This note was uploaded on 12/05/2011 for the course M 408k taught by Professor Schultz during the Spring '08 term at University of Texas at Austin.
- Spring '08
- Differential Calculus