# What happens if object is thrown in empty space?

If I throw a object in empty space, I apply a force to throw that. Then it gains some acceleration and it's speed increases.

So will it's speed keep on increasing, or it will get stable? If yes, what happened to the force I applied. No change in speed, so acceleration = 0, then $F = 0$.

-
You write "in empty space" but is there a gravitational potential? – alancalvitti Feb 20 '13 at 4:15

Concerning your question about where your force went. In a very literal sence, the force you applied is still present in the object as kinetic energy. This energy can be calculated as $$E = \frac{1}{2}mv^2$$ as long as $v \ll c$. It is this energy that determines how much force you need to slow the object back down to rest in the same distance as it was accelerated by you.