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خطا

$\eqalign{& {({F_{net}})_y} = {F_N} - mg = m{a_y} \Rightarrow {F_N} - 25 = 2/5 \times 2 \Rightarrow {F_N} = 30N  \cr & {f_k} = {\mu _k} \times {F_N} = 0/4 \times 30 = 12N  \cr & {({F_{net}})_x} = F - {f_k} = m{a_x} \Rightarrow F - 12 = 2/5 \times 3/2 \Rightarrow F = 20N  \cr & F = kx \Rightarrow 20 = k \times \frac{2}{{100}} \Rightarrow k = 1000\frac{N}{m} \cr} $