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WAEC Further Mathematics 2023 Question 19

Question 19

Dynamics

A particle began to move at 27 ms−1 along a straight line with constant retardation of 9 ms−2. Calculate the time it took the particle to come to a stop.

  1. A.4 sec.
  2. B.3 sec.
  3. C.2 sec.
  4. D.1 sec.
Show the answer and explanation

Answer: B (3 sec.)

Explanation

v = u − at: 0 = 27 − 9t, so t = 3 s.