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WAEC Physics 2022 Paper

Question : 8

Total: 50

Solution:

Concept:

The joule is the SI unit of energy or work.

Explanation:

Work is given by force multiplied by distance.

In SI base units, force equals mass times acceleration.

So, work has units of

\text{mass} \times \text{acceleration} \times \text{distance}

Substituting SI units,

1 \text{ J} = \text{kg} \times \frac{\text{m}}{\text{s}^2} \times \text{m}

This simplifies to

\text{kg} \, \text{m}^2 \, \text{s}^{-2}

This matches the required dimensional form of the joule.

Answer:

\text{Kg} \, \text{m}^2 \, \text{s}^{-2}

Option C is correct.

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