Acceleration is defined as the rate of change of velocity with respect to time. In this case, the person's speed increased by 20 m/s over a time of 20 seconds. To calculate the acceleration, we can use the formula:
Acceleration = (Change in velocity) / (Time)
In this case, the change in velocity is 20 m/s, and the time is 20 seconds. Substituting these values into the formula, we get:
Acceleration = 20 m/s / 20 s
Simplifying the equation:
Acceleration = 1 m/s²
Therefore, the person's acceleration is 1 m/s².
I hope I helped!
~~~Harsha~~~