Question 11

GRAPH OF SPEED VS. TIME
(for a car travelling along a straight road)

  • (a) After 20 s, how far is the car from its starting point?
  • Answer
  • (b) At which of the following times is the acceleration zero?
    A.  t = 10 s  B.  t = 25 s  C.  t = 40 s  D.  t = 45 s 
  • Answer
  • (c) What is the average speed during the interval 0 to 30 s?
  • Answer
  • (d)   What is the magnitude of the acceleration at t = 48 s?
  • Answer
    • A.  zero D.  2.5 ft/s2
    B.  2.0 ft/s2 E.  3.33 ft/s2
    C.  1.875 ft/s2 F.  90 ft/s2

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