A footballer starts from rest and reaches a velocity of 8.00 m/s in 2.50 s. What is his average acceleration?

1. Starting from rest means the initial velocity is zero, so the change in velocity is 8.00 m/s. 2. The elapsed time is 2.50 s. 3. Average acceleration is the change in velocity divided by the elapsed time. 4. Substitute the values: (8.00 m/s) / (2.50 s) = 3.20 m/s^2. 5. Multiplying instead of dividing gives 20.0, which is not an acceleration. _Source: OpenStax College Physics (CC BY 4.0), Ch 4 "Dynamics: Force and Newton's Laws of Motion", section 4.7 Further Applications of Newton's Laws of Motion_