### By taking the slope of the curve in Figure 2.63, verify that the acceleration is 3.2 m/s² at t = 10 s.

**Solution:**

Since the graph is a straight line, we can use the two points before and after the specified time to determine the slope of the line. The slope of the velocity-time graph is the acceleration.

The two points are

The velocityis computed as

Therefore, the acceleration is verified to be 3.2 m/s² at t=10 s.