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WAEC Physics 2012 Paper

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Question : 8

Total: 47

A bird flies at 10ms

^{-1}

^{-1}

for 3s and 20 ms

^{-1}

for 4s. Calculate the bird's average speed

4.5 ms^-1
15.0 ms^-1
15.5 ms^-1
51.7 ms^-1

Solution:

Av. speed = $\;\frac{3\;\times\;15\;+\;3\;\times\;10\;+\;4\;\times\;20}{3\;+\;3\;+\;4}$

= 15.5 ms

^{-1}

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