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If we assume their arms are each 0.75 m long and their individual masses are 56.0 kg, how hard are they pulling on one another? (answer is F= __N)

2. I thought I should use the equation F= G((M one)(M two))/radius squared

where G=6.67*10^-11 N*(m/kg)squared

3. I attempted to plug in the numbers to this equation and got F=3.7*10^-7

This answer was incorrect.

I know I am given time=2.4s, but I am not sure where to use this. ???

Please help