WAEC Physics 2014 Objective — Question 9
Question 9 of 50 from the West African Examinations Council (WAEC) Physics 2014 Objective paper, with the correct answer and a full explanation.
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A body is projected vertically upwards with a speed of 10ms⁻¹ from a point 2m above the ground. Calculate the total time taken for the body to reach the ground. [g=10ms⁻²]
- A. 1.00 s
- B. 2.00 s
- C. 2.18 sCorrect
- D. 3.00 s
Explanation
Using s=ut−½gt² with s=−2m: −2=10t−5t², giving 5t²−10t−2=0. Solving: t=(10+√140)/10 ≈ 2.18s.
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