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JAMB Physics 2023 Paper

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Question : 8

Total: 65

A lorry accelerates uniformly in a straight line with acceleration of

4\,\mathrm{m\,s}^{-2}

and covers a distance of 250 m in a time interval of 10 s. How far will it travel in the next 10 s?

650
900
800
250

Solution:

We first find the lorry's initial velocity

a = $4\,\mathrm{m\,s}^{-2}$ , s= 250m, t= 10, u=?

⇒ ut +

\frac{1}{2}×4×(10^2)<br> <br> <br> ⇒250= 10u + 200<br> <br> <br> ⇒ 250-200 = 10u<br> <br> <br> ⇒ 50 = 10u<br> <br> <br> ⇒U =\frac{50}{10}

=

5\,\mathrm{m\,s}^{-1}

For the next 10s, we set t=20s

= s = (5 × 20) +

\frac{1}{2} \times 4 \times 20^2

= s = 100 + 800

⇒ 900 m

;Distance covered:900-250 =650m

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