Question

Determine the magnitude of the acceleration for the speeding up and slowing down phase.
http://session.masteringphysics.com/problemAsset/1174254/4/2_18.jpg

Answer 1

Acceleration is simply a change in velocity over time. You just need to guesstimate the values on the graph to find the change.

Answer 2

For example, during the acceleration phase, it appears to be:
\[\Delta V / \Delta t = (0.75 - 0) / (0.25 - 0.2) = 15m/s^2\]