(B) The dimensional formula for momentum is calculated as follows:Momentum $(p)$ = mass $(m)$ $\times$ velocity $(v)$.The dimensions of mass are $[M]$

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(B) The dimensional formula for momentum is calculated as follows:Momentum $(p)$ = mass $(m)$ $\times$ velocity $(v)$.The dimensions of mass are $[M]$.The dimensions of velocity are $[LT^{-1}]$.Therefore,the dimensional formula for momentum is $[M] \times [LT^{-1}] = [MLT^{-1}]$.Thus,option $(b)$ is correct.