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Q.

Two lead balls of masses m and 5m having radii R and 2R are separated by 12R. If they attract each other by gravitational force, the distance covered by small sphere before they touch each other is

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a

10 R

b

7.5 R

c

9 R

d

2.5 R

answer is B.

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Detailed Solution

x=m2deff m1+m2; Here deff=9R
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