What is the gravitational force between two 20-kg iron balls separated by a distance of 0.5 m? The gravitational constant is G = 6.67 ´ 10-11 N-m2/kg2.
A. 2.67 ´ 10-9 N
B. 5.34 ´ 10-9 N
C. 5.34 ´ 10-8 N
D. 1.07 ´ 10-7 N
Answer: D. 1.07 ´ 10-7 N
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