A car starts from rest and accelerates uniformly at 2 m/s² for 5 seconds. What is its displacement during this time?
Show the answer and explanation
Correct answer
B. 25 m
Principle or equation
For uniformly accelerated motion starting from rest, displacement s = (1/2)at².
Why this answer is correct
Using s = (1/2)at² with a = 2 m/s² and t = 5 s, s = 0.5 × 2 × 25 = 25 m.
Example
A ball dropped from rest falls for 3 s. Using g = 10 m/s², the distance fallen is 0.5 × 10 × 9 = 45 m.
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