I have this problem that says a 3 kg object has a velocity of 7.00m/s j (vertical, right?). Then a total of 12.0Ni (horizontal) acts on it for 5 seconds. What is the objects final velocity. I know that the equation is Ft=mvf-mvi I could just plug everything in, but what's bothering me is the fat that the mass has an vertical velocity and the force is acting on it horizontally. Am I reading this wrong or is this the case? If so, how do I go avout finding what I need to plug in. My work: Ft=mvf-mvi (12N)(5s)=(5)(vf)-(5)(7)... then solve for vf, but that seems too easy.