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Answers (3)
In the third solution: F=mv/t m=0.25 kg and t=4ms=0.004 s. \\ correct.
a=Fn/m1+m2 a=8.25X10^-2 m/s^2. The correct answer.
{F_s} = {\mu _s}N N=mg. {F_k} = {\mu _k}N {F_s}=72 N {F_k}=51 N
