Physics

Problem

Planet X has a mass

M

and radius

R

with gravitational field strength

g

at its surface. Planet Y has mass

3M

and radius

2R

. What is the gravitational field strength at the surface of planet Y? A.

\frac{2g}{3}

\frac{3g}{4}

\frac{4g}{3}

\frac{3g}{2}