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Please this question has worried me. How to solve this?

Please this question has worried me. 
How to solve this?

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Grade:12

1 Answers

Abhishek Kumar
askIITians Faculty 255 Points
9 years ago
Use conservation of angular momentum and energy conservation.
mvob=mvR (It touches at the tip of the Planet A, hence R)
0.5mvo2 = 0.5mv2 + -GMm/R (When at infinity potential energy is zero)
2 equation and 2 unknown
Solve and the answer follows.

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