Calculate the acceleration of the jet car at a time of 25 s by finding the slope

Question:

Calculate the acceleration of the jet car at a time of 25 s by finding the slope of the vs. graph in Figure 2.49(a).

Data given in Figure 2.49

Velocity, v (m/s) (a) Acceleration, a (m/s) (b) 260 250 240 230 220 210 200 190 180 170 160 3 in + 3 2 1 0 -1

Strategy
The slope of the curve at t=25 s is equal to the slope of the line tangent at that point, as illustrated in Figure 2.49(a).

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