Answer:
B) 20/4
Step-by-step explanation:
Required rate = [tex]\frac{Number of balls launched}{Time}[/tex]
From the graph, it is evident that (4, 20), (8, 40), (12, 60) and (16, 80) are points.
This means that
20 balls launched in 4 seconds and the rate = 20/4
40 balls launched in 8 seconds and the rate = 40/8 = 20/4
60 balls launched in 12 seconds and the rate = 60/12 = 20/4
80 balls launched in 16 seconds and the rate = 80/16 = 20/4
Hence, the rate per second at which the machine launches the balls is 20/4 and the correct option is (B).
