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categoryفيزياء schoolبكالوريوس event_available2026-07-13

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CONCEPT QUESTIONS & SHORT ANSWERS (CONTINUED) (E) Car A is traveling at 40 km/h (kilometers per hour) along a straight section of road when it enters a 30 km/h speed zone. The driver of car A immediately applies the brakes, decelerating at a constant rate of 10 m/s² until reaching a speed of 30 km/h, which she then maintains. Car B is following A and traveling at a constant speed of 45 km/h. Car B is initially 60 meters behind as car A enters the speed zone? How far does car A travel into the speed zone before reaching the posted speed limit? Assuming car B does not brake as A decelerates to reach 30 km/hr: i) ii) • How close will car B get to car A? • Does car B enter the reduced speed zone, where the driver should apply the brakes? YES NO (Circle one answer) 45 km/h B -60 40 km/h A

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