The acceleration is (4 m/s) per second. So, this car will gain 4 m/s of speed with every passing second of time.

In other words,

v

=

4 m/s after 1 second of acceleration v

=

8 m/s after 2 seconds of acceleration,

and so on.

In algebraic terms, we can rearrange the original formula for acceleration.

average acceleration elapsed time = change in velocity

Written in symbols,

v = a t.

After 6 seconds, what will the speed gained (in m/s) by our car be?