Final answer:
The average acceleration of an object whose velocity increases from 0 to 20 m/s in 10 seconds is calculated using the formula for acceleration, resulting in an average acceleration of 2 m/s².
Step-by-step explanation:
If a velocity increases from 0 to 20 m/s in 10 seconds, the calculation for the average acceleration (a) can be done using the formula a = Δv / Δt, where Δv is the change in velocity and Δt is the change in time. Plugging in the values, we get a = (20 m/s - 0 m/s) / 10 s, which simplifies to a = 2 m/s².