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JAMB Physics 1989 Question 3

Question 3

Motion

Two points on a velocity-time graph have co-ordinates (5 s, 10 m s−1) and (20 s, 20 m s−1). Calculate the mean acceleration between the two points

  1. A.0.67 m s−2
  2. B.0.83 m s−2
  3. C.1.50 m s−2
  4. D.2.00 m s−2
Show the answer and explanation

Answer: A (0.67 m s−2)

Explanation

a = change in velocity ÷ time = (20 − 10)/(20 − 5) = 10/15 ≈ 0.67 m s−2.