A lorry accelerates uniformly in a straight line with acceleration of 4ms -2 and covers...
PHYSICS
JAMB 2023
A lorry accelerates uniformly in a straight line with acceleration of 4ms-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?
- A. 650
- B. 900
- C. 800
- D. 250
Correct Answer: A. 650
Explanation
We first find the lorry's initial velocity
a = \(4ms^-2\), s= 250m, t= 10, u=?
⇒ ut + \(\frac{1}{2}×4×(10^2)
⇒250= 10u + 200
⇒ 250-200 = 10u
⇒ 50 = 10u
⇒U =\frac{50}{10}\) = \(5ms^-1\)
For the next 10s, we set t=20s
= s = (5 × 20) + \(\frac{1}{2}×4×{20^2}\)
= s = 100 + 800
⇒ 900 m
;Distance covered:900-250 =650m
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