A car accelerates uniformly from rest and covers 100 m in 10 s. What is its acceleration?
Show the answer and explanation
Correct answer
B. 2 m/s²
Principle or equation
For uniformly accelerated motion starting from rest, displacement s = (1/2) a t².
Why this answer is correct
Given s = 100 m, t = 10 s, and u = 0. Using s = (1/2) a t², we have 100 = (1/2) a (10)² = 50 a, so a = 2 m/s².
Example
A ball dropped from rest falls 20 m in 2 s. Then 20 = (1/2) a (2)² gives a = 10 m/s² (if g = 10 m/s²).
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