Question

3 interpret the motion in the graph. distance (m) time (s) time (s) distance (m) 1 8

Explanation:

Step1: Read the graph

From the graph, when \(t = 1s\), \(d=4m\); when \(d = 8m\), \(t = 2s\).

Step2: Calculate the speed

The speed \(v=\frac{\Delta d}{\Delta t}\). Using the two - point \((t_1 = 1s,d_1=4m)\) and \((t_2 = 2s,d_2 = 8m)\), \(v=\frac{d_2 - d_1}{t_2 - t_1}=\frac{8 - 4}{2 - 1}=4m/s\). The graph is a straight line, which means the object is moving at a constant speed.

Answer:

The object is moving at a constant speed of \(4m/s\). When \(t = 1s\), \(d = 4m\); when \(d = 8m\), \(t=2s\)