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WAEC Physics 2018 Paper

Question : 8

Total: 50

ms^{-2}

Solution:

Concept:

The net force is the difference between two opposite horizontal forces, and

F = ma

Explanation:

The two forces act in opposite directions.

So, resultant force

= 10\,\mathrm{N} - 1\,\mathrm{N} = 9\,\mathrm{N}

Using Newton's second law:

F = ma

Substitute values:

9 = m \times 1.5

Therefore,

m = \frac{9}{1.5} = 6\,\mathrm{kg}

Answer:

The mass of the block is

6\,\mathrm{kg}

Hence, the correct option is A.

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