What kind of motion of a body is represented by the graphs given below ?

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$(a)$ Object is at rest and

$(b)$ Non$-$uniform motion.

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$(a)$ A car moving with uniform velocity $'u^{\prime}$ and uniform acceleration $'a^{\prime}$ covers a distance $'S^{\prime}$ in time $'t^{\prime}$. Draw its velocity $-$ time graph and derive an expression relating all the given physical quantities.

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