Test Index

WAEC Physics 2012 Paper

Question : 8

Total: 47

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for 4s. Calculate the bird's average speed

Solution:

Concept:

Average speed is total distance divided by total time.

Explanation:

Distance for the first part:

10 \times 3 = 30 \, \text{m}

Distance for the second part:

15 \times 3 = 45 \, \text{m}

Distance for the third part:

20 \times 4 = 80 \, \text{m}

Total distance:

30 + 45 + 80 = 155 \, \text{m}

Total time:

3 + 3 + 4 = 10 \, \text{s}

Average speed:

\frac{155}{10} = 15.5 \, \text{ms}^{-1}

Answer:

15.5 \, \text{ms}^{-1}

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