A bird flies at 10ms\(^{-1}\) for 3s, 15ms\(^{-1}\) for 3s and 20 ms\(^{-1}\) for 4s....
PHYSICS
WAEC 2012
A bird flies at 10ms\(^{-1}\) for 3s, 15ms\(^{-1}\) for 3s and 20 ms\(^{-1}\) for 4s. Calculate the bird's average speed
- A. 4.5 ms-1
- B. 15.0 ms-1
- C. 15.5 ms-1
- D. 51.7 ms-1
Correct Answer: C. 15.5 ms-1
Explanation
Av. speed = \(\frac{3 \times 15 + 3 \times 10 + 4 \times 20}{3 + 3 + 4}\)
= 15.5 ms\(^{-1}\)
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