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WAEC Physics 2010 Paper

Question : 8

Total: 50

Solution:

Concept:

The formula for average speed as

\frac{u+v}{2}

holds only when acceleration is constant.

Explanation:

Let the initial speed be

u

and the final speed be

v

Average speed

= \frac{u+v}{2}

is valid only when acceleration is uniform, meaning it does not change with time.

If acceleration is changing, increasing, or decreasing, this simple average cannot be used.

Answer:

B. uniform

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