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JAMB Physics 1997 Question 2

Question 2

Motion

The distance x m travelled by a particle in time t seconds is described by the equation x = 10 + 12t2. Find the average speed of the particle between the time interval t = 2 s and t = 5 s.

  1. A.60 m s−1
  2. B.72 m s−1
  3. C.84 m s−1
  4. D.108 m s−1
Show the answer and explanation

Answer: C (84 m s−1)

Explanation

At t = 2 s, x = 10 + 48 = 58 m; at t = 5 s, x = 10 + 300 = 310 m. Average speed = distance ÷ time = 252 ÷ 3 = 84 m s−1.