A car starts from rest and covers a distance of 40m in 10s. Calculate the magnitude of its acceleration?

A. 0.25 ms‾²
B. 0.80 ms‾²
C. 3.20 ms‾²
D. 4.00 ms‾²

Correct Answer: Option B

Explanation

S = ut + 12at²

40 = 0 x 10 + ½ x a x 10²

50a = 40

a = 40/50

= 0.8 ms‾²