Test Index

WAEC Physics 2016 Paper

Question : 8

Total: 47

Solution:

Concept:

For uniformly accelerated motion, the slope of a velocity-time graph gives acceleration.

Explanation:

The two given points are

(10\,\text{s},\,10\,\text{ms}^{-1})

and

(30\,\text{s},\,50\,\text{ms}^{-1})

Acceleration is the change in velocity divided by the change in time:

a = \frac{v_2 - v_1}{t_2 - t_1}

Substitute the values:

a = \frac{50 - 10}{30 - 10} = \frac{40}{20} = 2.0\,\text{ms}^{-2}

Answer:

The acceleration of the body is

2.0\,\text{ms}^{-2}

Correct option: B.

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