In $S = a + bt + c{t^2}$. $S$ is measured in metres and $t$ in seconds. The unit of $c$ is
A
None
B$m$
C$m{s^{ - 1}}$
D$m{s^{ - 2}}$
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D$m{s^{ - 2}}$
d (d) $c{t^2}$ must have dimensions of $L$
$ \Rightarrow $ $c$ must have dimensions of $L/{T^2}$ i.e. $L{T^{ - 2}}$.
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