physics
posted by tanya .
A 2.5 kg mass weighs 23.75 N on the surface
of a planet similar to Earth. The radius of this planet is roughly 7.7 × 10^6 m.
Calculate the mass of of this planet. The value of the universal gravitational constant is 6.67259 × 10^−11N · m2/kg2.
Answer in units of kg

g' om the planet is Wt/mass = 9.5 m/s^2
On earth, it is 9.8 m/s^2
M'/R'^2 = (95/98) Me/Re^2
Knowing the earth radius, Re and mass Me, you can calculate M'
You could also get M' from
F = G M' m/R'^2