Two stones are thrown up simultaneously with initial speeds of ' $u_1$ and $u_2\left(u_2 > u_1\right)$. They hit the ground after $6\,s$ and $10\,s$ respectively. Which graph in figure correctly represents the time variation of $\Delta x=\left(x_2-x_1\right)$, the relative position of the second stone with respect to the first upto $t=10\,s$ ? Assume that the stones do not rebound after hitting the ground.
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