WAEC Physics 2025 Objective — Question 49
Question 49 of 51 from the West African Examinations Council (WAEC) Physics 2025 Objective paper, with the correct answer and a full explanation.
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A boy pushes a box of mass 80kg along a horizontal floor with a force of 200N. If the box is pushed with a uniform velocity, what is the coefficient of friction between the box and the floor? [g = 10 ms⁻²]
- A. 0.25Correct
- B. 0.40
- C. 0.50
- D. 0.65
Explanation
Uniform velocity means net force = 0, so the applied force equals the frictional force: F = Fr = μmg. μ = F/(mg) = 200/(80×10) = 200/800 = 0.25.
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