An object starts from rest and accelerates uniformly at 2 m/s² for 3 s. What is its final speed?

A) 3 m/s

B) 6 m/s

C) 9 m/s

D) 12 m/s

Answer: B

Explanation: Use final speed = acceleration × time from rest for the stated idealized conditions. Substitution gives 2 × 3 = 6 m/s.