A car accelerate 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
Correct Answer: Option D
Explanation
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