A ball moves in a straight line (the x-axis). The graph in the figure shows this

Question

A ball moves in a straight line (the x-axis). The graph in the figure shows this ball's velocity as a function of time. Suppose that the ball moved in such a way that the graph segment after 2.0 s was -3.0 m/s instead of +3.0 m/s. Find the ball's and average velocity during the first 2.8 s in this case. Express your answer using two significant figures. Suppose that the ball moved in such a way that the graph segment after 2.0 s was -3.0 m/s instead of +3.0 m/s. Find the ball's average speed during the first 2.8 s in this case. Express your answer using two significant figures.

Explanation / Answer

remember that velocity is displacement/time, and speed is distance/time C) find the area under the graph to get the displacement 2*2 - 3*.8 = 1.6m 1.6m/2.8s = .5714m/s D) Find the area under the curve to get the distance 2*2 + 3*.8 = 6.4m 6.4m/2.8s = 2.2857m/s

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