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d=ut+1/2at² , u=0 2100=(0)t+1/2a(8)² a=65.63m/s² Fx=ma Ffr=ma.{1} Fy=ma , Fy= Fn-mg , Fy=0 Fn=mg.{2} Ffr=µsFn ma=µs(mg) a/g=µs 65.63/9.8=µs µs=6.70N

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