An object is fired from the earth's surface with a speed of 2.00x10^4 m/s. What will its speed be when it is very far from the earth? (neglect friction) so... what I did was find the excape velocity of the earth, which is 11190.7 m/s then subtract that from the initial speed. my teacher said that when and object is fired at excape velocity, it will slow down to 0m/s when it is at an infinite distance from the earth. so if I just subtract 2.00x10^4-11190.7 then that will give me the velocity it should have, which is 8806 m/s, but my book says 1660 m/s. What did I do wrong?