Test Index

JAMB Physics 2013 Paper

Question : 5

Total: 43

Solution:

Concept:

Use the first equation of motion under uniform acceleration,

v = u + at

, to find the time for final velocity to become zero.

Explanation:

Initial velocity,

u = 20\ \mathrm{m/s}

Final velocity at complete halt,

v = 0

Deceleration means acceleration

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

Substitute into

v = u + at

0 = 20 + (-2)t

-20 = -2t

t = \frac{20}{2} = 10\ \mathrm{s}

Answer:

The time required is

10\ \mathrm{s}

, so option B is correct.

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