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[tex]\\ \sf\longmapsto Acceleration=\dfrac{v-u}{t}[/tex]
[tex]\\ \sf\longmapsto Acceleration=\dfrac{0.7-0.3}{30}[/tex]
[tex]\\ \sf\longmapsto Acceleration=\dfrac{0.4}{30}[/tex]
[tex]\\ \sf\longmapsto Acceleration=0.01m/s^2[/tex]