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WAEC Further Mathematics 2017 Question 34

Question 34

Dynamics

A force (10i + 4j)N acts on a body of mass 2 kg which is at rest. Find the velocity after 3 seconds.

  1. A.(5/3 i + 2/3 j) ms−1
  2. B.(10/3 i + 4/3 j) ms−1
  3. C.(5i + 2j) ms−1
  4. D.(15i + 6j) ms−1
Show the answer and explanation

Answer: D ((15i + 6j) ms−1)

Explanation

a = F/m = 5i + 2j; v = at = 3(5i + 2j) = 15i + 6j ms⁻¹.