1. The problem statement, all variables and given/known data A satellite is revolving around the Earth in a circular orbit with radius of 2R, where R is radius of earth.If suddenly,its velocity becomes zero in the orbit due to collision with some inter-stellar object(like a satellite),find the time which it takes to hit surface of the earth. Ignore the effect of atmosphere and treat earth to be perfect sphere. 2. Relevant equations Necessary formulas. . all are at hand. 3. The attempt at a solution There are a no. of confusions I'm having. Firstly, What is aftermath motion of the satellite. Does it swirl inwards towards the earth or fall directly. Secondly, Since there is no energy dissipation the energy remains conserved ie., Since PE decreases the KE should increase. Also the Angular Momentum should remain conserved about the earth. Will it suffice to solve this? Or Am I missing something?