تم الحل ✓
categoryفيزياء
schoolبكالوريوس
event_available2026-07-13
السؤال
Transcribed Image Text:
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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