Weight and g: An astronaut drops a marble on the surface of the airless Planet Z-49 and observes that it takes 1.02 s for the marble to fall 2.00 m starting from rest. She also knows that the radius of Z-49 is 3.39 × 106 m. From this information, what will she determine for the mass of Z-49? (G = 6.67 × 10-11 N ? m2/kg2)
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.
Answer: B
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