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JAMB Physics 1999 Question 7

Question 7

Motion

The diagram above shows the velocity time graph of a vehicle. Its acceleration and retardation respectively are

Diagram for this question
  1. A.8.0 m s−2, 4.0 m s−2
  2. B.4.0 m s−2, 8.0 m s−2
  3. C.4.0 m s−2, 2.0 m s−2
  4. D.2.0 m s−2, 4.0 m s−2
Show the answer and explanation

Answer: C (4.0 m s−2, 2.0 m s−2)

Explanation

Acceleration = 80/20 = 4.0 m s−2 (0 to 20 s). Retardation = 80/(90 − 50) = 2.0 m s−2.