An Astronaut Drops a Marble on the Surface of Mars

Multiple Choice

An astronaut drops a marble on the surface of Mars and observes that it takes 1.02 s for the marble to fall 2.00 m. She also knows that the radius of Mars is 3.39 × 10⁶ m and that G = 6.67 x 10^-11 N·m²/kg². From this information, she can conclude that the mass of Mars is

A) 3.30 × 10²³ kg.
B) 6.62 × 10²³ kg.
C) 4.62 × 10²³ kg.
D) 8.09 × 10²³ kg.
E) 9.95 × 10²³ kg.