WAEC Physics 2015 Objective — Question 12
Question 12 of 50 from the West African Examinations Council (WAEC) Physics 2015 Objective paper, with the correct answer and a full explanation.
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A bullet fired vertically upwards reaches a height of 500 m. Neglecting air resistance, calculate the magnitude of the initial velocity of the bullet. [g = 10 ms⁻²]
- A. 500.0 ms⁻¹
- B. 100.0 ms⁻¹Correct
- C. 70.0 ms⁻¹
- D. 50.0ms⁻¹
Explanation
At maximum height v = 0, so from v² = u² − 2gh: 0 = u² − 2(10)(500), giving u² = 10000 and u = 100.0 ms⁻¹.
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