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![[Post New]](/templates/default/images/icon_minipost_new.gif) 2 Dec 2007 20:38:53 IST
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Hey Tarun,
All the above replies are correct.
You can conserve momentum when you consider particle and earth as a system. Then gravitational force becomes internal force.
IN that case when momentum of particle decreases, momentum of earth increases but as mass of earth is very huge, the change in earth's velocity is not noticeable.
Hope you understood.
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