Answer:
1.5 m/s
Explanation:
Velocity = slope of the graph of displacement - time graph.
[tex] = \frac{9 - 3}{4 - 0} [/tex]
[tex] = \frac{6}{4} = \frac{3}{2} [/tex]
= 1.5 m/s
Object's velocity = 1.5 m/s
