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[tex]\\ \sf\longmapsto KE=\dfrac{1}{2}mv^2[/tex]
[tex]\\ \sf\longmapsto KE=\dfrac{1}{2}(0.5)(4)^2[/tex]
[tex]\\ \sf\longmapsto KE=0.25(16)[/tex]
[tex]\\ \sf\longmapsto KE=4J[/tex]