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Super! You can see that from \(4 \, \mathrm{s}\) to \(6 \, \mathrm{s}\), Jerry has covered the maximum distance. So, his speed of \(10 \, \mathrm{m/s}\) was the maximum. During the first and last \(2\) seconds, his speed was only \(2.5 \, \mathrm{m/s}\).
An object's velocity tells us how quickly its position is changing. But, as we just saw, velocity and speed can themselves change. Jerry's velocity increased, and then decreased (ignore negative value of the velocity).

Just like velocity tells us how fast an object's position is changing, acceleration tells us how fast the velocity itself is changing. Mathematically, \(\text{Acceleration} = \frac{\text{Change in Velocity}}{\text{Time}}\).