The questions below apply to the following graph, which shows the position vs. t

Question

The questions below apply to the following graph, which shows the position vs. time graph for two cars A and B 400 350 300 E 250 200 150 100 50 0 2 468 10 14 16 18 20 Time (s) 16. The velocity of car B at 10 s is A) positive negative C) zero 17. At which of the given times below have the two cars the same instantaneous velocity? A) 0 s B) 6 s 3.5 s D) 13 s E) 17.5s 18. At the instant oft s, car A is A speeding up B) slowing down 9) moving with constant speed 19. What is the approximate instantaneous velocity of car A at t-10 s? A) 0 m/s B) -17.3 m/s C) 4.7 m/s D) -22 m/s E 17.3 m/s 20. How does the magnitude of the average velocity of car A compare to car B over the entire time interval? .lv,/>Pal c. Iv,l

Explanation / Answer

19.

instanteneous velocity = slope of line PR = PQ/QR = (0 - 100)/(13 - 7) = - 16.67

neareast choice from the available choice is - 17.3 . hence the correct choice is B)

20.

|vA| = (final position - initial position)/time interval = |(175 - 300)|/20 = 6.25 m/s

|vB| = (final position - initial position)/time interval = |(100 - 300)|/20 = 10 m/s

hence |vA| < |vB|

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