the diagram shows 4 identical ball bearings, placed between 2 blocks on a steel ruler. Calculate the diameter of one ball bearing

Answer:
[tex]2 \: cm[/tex]
Explanation:
Total diameter:
[tex]12 - 4 = 8 \: cm[/tex]
Diameter of 1 ball:
[tex] \frac{8}{4} = 2 \: cm[/tex]