It should be 18, because despite of 3,14, because that's pi and radius is half of the diameter, so36 divide 2 is 18.
I think you may have already asked this.. but the answer is continuous. Hope that helps!!
The answer is :23
B:34
C:56
Force = mass x exceleration
1100 x 0.5 = 550
I think the answer is C not to sure
