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If $x=a t+b t^2$, where $x$ is the distance travelled by the body in kilometres while $t$ is the time in seconds, then the units of 6 are
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The correct answer is:
$\mathrm{km} / \mathrm{s^{2}}$
$[x]=\left[b t^2\right] \Rightarrow[b]=\left[x / t^2\right]=k m / s^2$
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