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JAMB Physics 2019 Paper

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Question : 7

Total: 100

A train has an initial velocity of 44m/s and an acceleration of -4m/s

^2

. Calculate its velocity after 10 seconds

10m/s
6m/s
8m/s
4m/s

Solution:

Concept:

Use the first equation of motion for uniform acceleration.

Explanation:

Given: initial velocity,

u = 44\ \mathrm{m/s}

; acceleration,

a = -4\ \mathrm{m/s^2}

; time,

t = 10\ \mathrm{s}

.

The equation is

v = u + at

.

Substitute the values into the equation:

v = 44 + (-4)(10)

Simplify:

v = 44 - 40

v = 4\ \mathrm{m/s}

Answer:

D.

4\ \mathrm{m/s}

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