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If $v = a/t + bt^{3}$ where v = velocity and t is time The dimensional formula of a and b are
Explanation
Dimensionally $v = a/t \Rightarrow a = LT^{-1} \times T = L$ also dimensionally $v = bt^{3} \Rightarrow b = LT^{-1}/T^{3} = LT^{-4}$