WAEC Mathematics 2016 Objective — Question 4
Question 4 of 50 from the West African Examinations Council (WAEC) Mathematics 2016 Objective paper, with the correct answer and a full explanation.
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4. The distance, d, through which a stone falls from rest varies directly as the square of the time, t, taken. If the stone falls 45cm in 3 seconds, how far will it fall in 6 seconds? A. 90cm B. 135cm C. 180cm D. 225cm
- A. 90cm
- B. 135cm
- C. 180cmCorrect
- D. 225cm
Explanation
d=kt²; k=45/9=5; when t=6, d=5×36=180cm.
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