Q.

The mass of a ball is four times the mass of another ball. When these balls are separated by a distance of 10cm, the gravitational force between them is 6.67x10-7 N . The masses of the two balls are ( in kg)

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a

10 , 20

b

5 , 20

c

20 , 30

d

20 , 40

answer is B.

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Detailed Solution

Fg=Gm1m2R2, Given, m2 = 4m1
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