# oldhw 05 - alexander(jra2623 oldmidterm 05 Turner(92510...

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alexander (jra2623) – oldmidterm 05 – Turner – (92510) 1 This print-out should have 7 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A car is moving at constant speed on the freeway. The driver sees a patrol car at time t 1 and rapidly slows down by around 10 miles per hour. After continuing at this speed for a few minutes, the driver at time t 2 returns to the earlier constant speed. Which graph correctly describes the car’s acceleration a ( t ) as a function of time? Take the forward direction of motion as positive. 1. t 1 time 0 0 a t 2 2. t 1 time 0 0 a t 2 3. t 1 time 0 0 a t 2 correct 4. t 1 time 0 0 a t 2 5. t 1 time 0 0 a t 2 6. t 1 time 0 0 a t 2 7. t 1 time 0 0 a t 2 8. t 1 time 0 0 a t 2 Explanation: Analyze the acceleration over each part of the trip: 1) Moves at constant speed: a = 0 2) Rapidly slows down: a < 0 briefly 3) Continues at this speed: a = 0 4) Returns to earlier speed: a > 0 briefly 5) Original constant speed: a = 0 002 10.0 points

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