Final answer:
Using the formula for uniform acceleration and plugging in the given values, the final velocity of a car that starts from rest and accelerates at a rate of 4 m/s^2 for 10 seconds is found to be 40 m/s.
Step-by-step explanation:
The question relates to the concept of uniform acceleration in physics. Using the given formula (vf = vi + at) where vf is the final velocity, vi is the initial velocity, a is the acceleration, and t is the time, we can calculate the final velocity of the car. Since the car starts from rest, this means vi = 0 m/s. The acceleration a is given as 4 m/s2, and the time t is 10 seconds.
Plugging in the given values into the formula we get:
vf = 0 m/s + (4 m/s2 × 10 s)
vf = 0 + 40 m/s
vf = 40 m/s
Hence, the correct answer is A. 40 m/s.