A car starts from rest and accelerates uniformly at 2.5 m/s² for 10 s. What is the displacement of the car during this time?
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Correct answer
C. 125 m
Principle or equation
For uniformly accelerated linear motion starting from rest, displacement s = (1/2) a t².
Why this answer is correct
Given a = 2.5 m/s² and t = 10 s, s = 0.5 × 2.5 × (10)² = 0.5 × 2.5 × 100 = 125 m.
Example
A train accelerates from rest at 1.0 m/s² for 20 s. Displacement = 0.5 × 1.0 × 400 = 200 m.
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