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JAMB Physics 2013 Question 3

Question 3

Scalars and Vectors

The resultant of two forces is 50N. If the forces are perpendicular to each other and one of them makes an angle of 30° with the resultant, find its magnitude.

  1. A.100.0N.
  2. B.57.7N.
  3. C.43.3N.
  4. D.25.0N.
Show the answer and explanation

Answer: C (43.3N.)

Explanation

Two perpendicular forces are the components of the resultant. The one at 30° to the resultant is 50 cos 30° ≈ 43.3 N.