Answer :
This question involves the concepts of acceleration, time, and velocity.
Micah needs "time" to determine acceleration.
Acceleration is defined as the rate of change of velocity. Mathematically,
[tex]a=\frac{\Delta v}{t}[/tex]
where,
a = acceleration
Δv = change in velocity
t = time interval
Since Micah knows the change in velocity. Therefore, the only thing she needs to know the acceleration is time.
Learn more about acceleration here:
https://brainly.com/question/2437624