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[tex]\\ \sf\Rrightarrow K.E=\dfrac{1}{2}mv^2[/tex]
[tex]\\ \sf\Rrightarrow 3.5=\dfrac{1}{2}m(17)^2[/tex]
[tex]\\ \sf\Rrightarrow 7=289m[/tex]
[tex]\\ \sf\Rrightarrow m=\dfrac{7}{289}[/tex]
[tex]\\ \sf\Rrightarrow m=0.024kg[/tex]