An object starts from rest and accelerates uniformly at 7 m/s² for 8 s. What is its final speed?

A) 56 m/s

B) 28 m/s

C) 84 m/s

D) 112 m/s

Answer: A

Explanation: Use final speed = acceleration × time from rest for the stated idealized conditions. Substitution gives 7 × 8 = 56 m/s.