A car accelerates uniformly from rest at 4 ms\(^{-2}\). How far will it travel in the fifth complete second?
A
100 m
B
50m
C
32 m
D
18 m
Verified Correct Answer: D.
Physical Principles & Numerical Solution
From S = ut + 1/2 at2
S = 1/2 ut2, since U = 0
Let S5 = distance in 5 seconds
= 1/2 x 4 x 52 = 2 x 25 = 50m
S4 = distance covered in 4 seconds
= 1/2 x 4 x 42 = 2 x 16 = 32m
Distance covered in the fifth second
S5 - S4 = 50m - 32m = 18m
Source: WAEC / JAMB / NECO Classroom Archive (Record #14497)