What is the final velocity of a runner who is accelerating at 2 feet per second squared for 3 second with an initial velocity of 4 feet per second

He starts at a speed of 4 fps.

He adds 2 fps of speed during each of 3 seconds, for a gain of 6 fps.

At the end of the 3 sec, his speed is (4 + 6) = 10 fps.

We know nothing about the direction in which he runs, so we're in no position to discuss velocity. The best we can do is to determine his final speed.

What is the inequality?

One statement could be 12/4=3