Physics

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A dog team driven by an Inuit hunter pulls two toboggans (Figure 1.49).
The dog team can apply a maximum force of 700 N. Each toboggan
experiences a constant frictional force of 100 N.
a) Determine the acceleration of the two toboggans, if each has a
mass of 300 kg.
b) What is the force in the rope joining the two toboggans together?

I know how to calculate the acceleration if there's no friction. Fnet=ma. 700N/600kg=a, but how do you do it if there's frictional force?

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