WAEC Physics 2016 Objective — Question 9
Question 9 of 50 from the West African Examinations Council (WAEC) Physics 2016 Objective paper, with the correct answer and a full explanation.
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9. At a birthday party, the celebrant pops a corked fruit wine. If the cork shoots out of the bottle at an angle of 40° to the horizontal and travels a horizontal distance of 4.50 m in 1.25s, calculate the initial speed of the cork. A. 4.2 ms⁻¹ B. 4.7 ms⁻¹ C. 5.6 ms⁻¹ D. 7.1 ms⁻¹
- A. 4.2 ms⁻¹
- B. 4.7 ms⁻¹Correct
- C. 5.6 ms⁻¹
- D. 7.1 ms⁻¹
Explanation
Horizontally, R=u cos40°×t → 4.5 = u cos40° × 1.25 → u = 4.5/(1.25×cos40°) = 4.7 m/s.
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