# science

A bus makes a trip according to the position–time graph shown in the illustration. What is the average acceleration (in km/h2) of the bus for the entire 3.5-h period shown in the graph?

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1. I'd say that the velocity at the beginning of the trip was around
V1 = 40km / 1h → by reading the graph
and at the end of the trip was
V2 = (45 - 57)km / (3.5 - 2.2)h = -9.2 km/h → also estimating from the graph

a = (V2 - V1) / t = (-9.2 - 40)km/h / 3.5h = -14 km/h²
Not sure, though.

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