So I'm doing a Physics problem here and I'm down to my last answer and I honestly can't figure out where I'm going wrong. The problem is as follows:
From t = 0 to t = 4.22 min, a man stands still, and from t = 4.22 min to t = 8.44 min, he walks briskly in a straight line at a constant speed of 1.06 m/s. What is his average acceleration in the time interval 1.00 min to 5.22 min? What is his average acceleration in the time interval 2.00 min to 6.22 min?
It's my understanding that average acceleration is the change in velocity over the change in time which would lead to this calculation, correct?
$\frac{1.06 m/s}{253.2s}$ which gives the result of $0.004 m/s^2$ but this answer is apparently incorrect. Am I missing a step somewhere? Or do I just not understand average acceleration?