Editor
What are the units of $\rm{a}$ and $\rm{b}$ in $\rm{v = a + bt}$, where unit of $\rm{v=ms ^{-1}}$ and $\rm{t =s}$
Difficulty: Easy
A: 
$\rm{a=ms ^{-1}}$ and $\rm{b=ms ^{-2}}$
B: 
$\rm{a=ms ^{-1}}$ and $\rm{b=ms ^{-1}}$
C: 
$\rm{a=ms ^{-2}}$ and $\rm{b=ms ^{-2}}$
D: 
$\rm{a=ms ^{-2}}$ and $\rm{b=ms ^{-1}}$
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