That is what sir issac newton stated.... lets take an example for the sort, if you had a big rock and it wasnt moving, it would be using inertia..
The same thing happens when a rock is moving, it wants to keep on moving...(in space that is): here is a video to help you
If you still dont understand,
just reply ur question to this post!
This post has been edited by yash daddy: 3 January 2012 - 02:27 PM

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