Box M2 sits atop M1. (M1=25kg M2=15kg). The coefficient of friction between boxes and between M1 and the ground is Uk=.4 and Us=.5. I found that 353N is the maximum force you can apply to box 1 so that box 2 doesn't slip off. Now it asks for the acceleration of M1 and M2 if the force is doubled to 706, knowing that box M2 will slip off of M1. Plugging in 706 for F into F=ma does not work. How can this be solved?
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