Solve.The gravitational attraction A between two masses varies inversely as the square of the distance between them. The force of attraction is 4 lb when the masses are 3 ft apart, what is the attraction when the masses are 6 ft apart?
A. 4 lb
B. 1 lb
C. 2 lb
D. 3 lb
Answer: B
Mathematics
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A. 
= 
B. 
= 
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= 
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