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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
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Correct Answer: Option C
Explanation

Av. speed = \(\frac{3 \times 15 + 3 \times 10 + 4 \times 20}{3 + 3 + 4}\)

= 15.5 ms\(^{-1}\)

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