Final answer:
Tanner's acceleration is 10 m/s², as his velocity increases by 10 m/s every second from a starting speed of 0 m/s to 10 m/s over 1 second.
Step-by-step explanation:
If Tanner runs from 0 m/s to 10 m/s in 1 second, his acceleration is found by using the formula for acceleration, which is the change in velocity divided by the time over which the change occurs. In this case, the change in velocity is 10 m/s - 0 m/s = 10 m/s, and the time is 1 second. Therefore, Tanner's acceleration is 10 m/s². This means that for every second, Tanner's velocity increases by 10 m/s.