A body starts from rest and accelerates uniformly at 4 m/s². What is its velocity after 5 seconds?
10 m/s
20 m/s
25 m/s
15 m/s
Correct Answer: B — 20 m/s
Explanation:
Using v = u + at. u = 0, a = 4 m/s², t = 5 s. v = 0 + 4 × 5 = 20 m/s.
