A) \[2.5\] R
B) \[4.5\] R
C) \[7.5\] R
D) \[1.5\] R
Correct Answer: C
Solution :
[c] Let at O, there will be a collision. If smaller sphere moves x distance to reach at O, then bigger sphere will move a distance of (9R - x). |
By universal law of gravitation, |
Acceleration of smaller sphere, |
Acceleration of bigger sphere, |
. (i) |
. (ii) |
Thus, dividing Eq. (i) by Eq. (ii), we get |
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