The acceleration due to gravity at the surface of a planets mass and size; therefore other planets will have an acceleration due to gravity different from $9\mathrm{.}8$ m$/$s$$². Imagine an astronaut stands on an alien planet, which has no atmosphere, and throws a rock with a speed of $6\mathrm{.}95$ m$/$s in the horizonal direction, releasing it at a height of $1\mathrm{.}40$ m above the surface of the planet. The rock huts the surface a horizonal distance of $9\mathrm{.}10$ m from the astronaut. Find the magnitude of the acceleration due to gravity, in m$/$s$\mathrm{²},$ on this alien planet?