Question

Suppose a planet has twice the mass of the earth and twice the earth's radius. What is the acceleration of an object in free fall on this planet?

2.5 m/s2
4.9 m/s2
9.8 m/s2
4.9 × 106 m/s2

Answer 1

earth's *2
----------
(2)^2

Answer 2

\[gravity= \frac{G m}{r^2}\]