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JAMB Physics 2012 Paper

Question : 4

Total: 42

Solution:

Concept:

Use the equation of motion for distance under uniform acceleration from rest.

Explanation:

The car starts from rest, so initial velocity

u = 0

Given acceleration

a = 30 \, \mathrm{m\,s^{-2}}

and time

t = 20 \, \mathrm{s}

The distance covered is given by:

S = ut + \frac{1}{2}at^2

Substitute the values:

S = (0)(20) + \frac{1}{2}(30)(20^2)

S = 0 + 15 \times 400 = 6000 \, \mathrm{m}

Convert metres to kilometres:

6000 \, \mathrm{m} = 6 \, \mathrm{km}

Answer:

A. 6 km

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