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Dear Student ,
Here in this case from the given data we can write that ,
f1=μ1R1=15×300+200×10=1000 Nand f2=μ2R2=14×200×10=500 NSo the horizontal force needed to move B is ,F=f1+f2=1000+500=1500 N Thus we needed force more than 1500 N in order to move B .Regards

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