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In the figure, a square of edge length $19\mathrm{.}0$ cm is formed by four spheres of masses $m_1=5\mathrm{.}30g,m_2=2\mathrm{.}90g,m_3=1\mathrm{.}30g,$ and $m_4=5\mathrm{.}30g.$ In unit$-$vector notation, what is the net gravitational force from them on a central sphere with mass $m_5=2\mathrm{.}20g?$

Number

$$ hat$(i)+$ widehat$(j)$ Units $$