[tex]\\ \bull\tt\dashrightarrow Acceleration=\cfrac{v-u}{t}[/tex]
[tex]\\ \bull\tt\dashrightarrow Acceleration=\dfrac{0.54-1.8}{30}[/tex]
[tex]\\ \bull\tt\dashrightarrow Acceleration=\dfrac{-1.26}{30}[/tex]
[tex]\\ \bull\tt\dashrightarrow Acceleration=-0.042m/s^2[/tex]