Gravity Exploration│Please help!

Question

1) The Sun has a mass of 1.99 × 10³⁰ kg and a radius of 6.96 × 10⁸ m. What is the acceleration due to gravity at the surface of the Sun?

2) The mass of the Earth is 5.97 × 10²⁴ Kg , and the radius of the Earth is 6.38 × 10⁶ m. What is the force of gravity acting on a car that has a mass of 1.5×10³ kg?

Answer 1

1) mg = GMm/R²; g = GM/R² = 6.67430·10^-11m³kg^-1s^-2·1.99·10³⁰kg/(6.96·10⁸m)² = 274.2 m/s²

2) mg = GmM/R² = 6.6743·10^-11m³·kg^-1s^-2·5.97·10²⁴kg·1500kg/(6.38·10⁶m)² = 14683.5 N