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ok, so far I've drawn a picture, and converted all my information, and if I'm correct, I need to use this formula: a= v^2/r

but if its a centripetal acceleration problem then where does the birth rate come into play? I'm so confused...

4mph = 1.34m/sec

4 ft = 1.22m

r= 20 people

d= 40 people

v= 1.34 m/sec

a= 1.34^2/20?

& babies per hr. = frequency