Can any body helps me with this problem

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The discussion centers around a user seeking help with a physics problem related to frictional force and F1. The user expresses difficulty due to a lack of understanding of physics concepts. Forum members suggest that future questions should be posted in the homework section for quicker assistance. They also recommend using a specific template to outline the problem and any attempted solutions. Engaging with the community in the appropriate forum can enhance the chances of receiving timely help.
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Can anybody helps me with this problem!

Hello guys ... I'm doing project i will not bother you with the details ... but i got stock in a physics issue because i forgot every thing about physics so may i get advantage with your help ... I am trying to fing the frictional force and find F1 ... I'm i will get some help... the graph is in the attachment ... thank you
 

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Hi Dexter and welcome to the forums,

It would be much appreciated if in future you could post all such questions in the homework forums and use the template provided (in the homework forums). By posting in the homework forums, your much more likely to faster receive help than if you posted in the general forums. Perhaps if you could post your thoughts and attempt using the following template;
 
Thread 'Variable mass system : water sprayed into a moving container'
Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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