Two cars $\mathrm{A}$ and $\mathrm{B}$ are moving in the same direction with equal speeds. A passenger in the car $\mathrm{A}$ finds that the car $\mathrm{B}$ is at rest.

The fig. $3.Q.1$ shows the displacement time graph of a particle moving along $x$- axis.

A rocket fired vertically upwards with constant acceleration has its fuel exhausted in $10 \mathrm{s}$. What is the maximum height reached by the rocket if its velocity at the end of ${10}^{th}$ second is $600 \mathrm{m}/\mathrm{s}$

Assume $g=10 \mathrm{m}/{\mathrm{s}}^2$.