The acceleration due to gravity at the surface of a planet depends on the planet's mass and size; therefore other planet

[answerhappygod]

The acceleration due to gravity at the surface of a planet
depends on the planet's mass and size; therefore other planets will
have accelerations due to gravity different from 9.8
m/s2. Imagine an astronaut stands on an alien
planet, which has no atmosphere, and throws a rock with a speed
of 7.35 m/s in the horizontal direction, releasing
it at a height of 1.40 m above the surface of the planet.
The rock hits the surface a horizontal distance
of 8.70 m from the astronaut. Find the magnitude of
the acceleration due to gravity, in m/s2, on this alien
planet.
_______m/s^2