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WAEC Further Mathematics 2009 Question 40

Question 40

Statics

A body is acted upon by forces F1 = (10 N, 090°) and F2 = (6N, 180°). Find the magnitude of the resultant force, correct to one decimal place.

  1. A.11.6N
  2. B.11.7N
  3. C.11.8N
  4. D.11.9N
Show the answer and explanation

Answer: B (11.7N)

Explanation

The forces are at right angles, so the resultant is √(102 + 62) = √136 ≈ 11.7 N.