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JAMB Physics 2010 Paper

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Question : 3

Total: 47

A car moves with an initial velocity of 25 ms-1 and reaches a velocity of 45 ms-1 in 10s. what is the acceleration of the car?

2 ms^-2
5 ms^-2
20 ms^-2
25 ms^-2

Solution:

Concept:

Acceleration is the rate of change of velocity with time.

Explanation:

Use the formula:

a = \frac{v - u}{t}

where

u = 25 \, \mathrm{m/s}

is the initial velocity,

v = 45 \, \mathrm{m/s}

is the final velocity, and

t = 10 \, \mathrm{s}

is the time taken.

Substitute the values:

a = \frac{45 - 25}{10} = \frac{20}{10} = 2 \, \mathrm{m/s^2}

So the acceleration of the car is

2 \, \mathrm{m/s^2}

.

Answer:

A.

2 \, \mathrm{m/s^2}

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