Exoplanets $($planets outside our solar system$)$ are an active area of modern research. Suppose astronomers find such a planet that has the same mass as Earth, but has a radius that is about $10\%$ less. Roughly, what acceleration due to gravity would you expect if you were standing on the surface of this new planet?$$

Answer

Roughly $12$ m$/$s$2$

Roughly $10$ m$/$s$2($same as Earth$)$

Roughly $11$ m$/$s$2$

Roughly $9$ m$/$s$2$

I don't know yet