Uniform density with mass m and radius r. suppose the planet is surrounded with a thin shell of mass 0.1m and a radius of 1.5r. what is the net gravitational force on a mass m located at a radius o a) Gm^2/r^2
b) 0.1Gm^2/1.5r^2
c) 0.1Gm^2/r^2
d) Gm^2/1.5r^2