WAEC Physics 2021 Objective — Question 41
Question 41 of 50 from the West African Examinations Council (WAEC) Physics 2021 Objective paper, with the correct answer and a full explanation.
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41. A stone is thrown horizontally with an initial velocity of 15 ms⁻¹ from a tower 20 m high. How long does it take to reach the ground? [g=10 ms⁻²]
- A. 2 sCorrect
- B. 4 s
- C. 5 s
- D. 1 s
Explanation
Using s=ut+½gt² for the vertical motion (u=0 vertically): 20=½×10×t² → t²=4 → t=2 s.
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