An Object of Mass 0

Multiple Choice

An object of mass 0.50 kg is transported to the surface of Planet X where the object's weight is measured to be 20 N.The radius of the planet is 6.0 × 10⁶ m.What is the mass of Planet X? (G = 6.67 × 10−¹¹ N ⋅ m²/kg²)

A) 1.80E+18 kg.
B) 5.40E+24 kg
C) 2.16E+25 kg
D) 1.80E+18 kg