I am trying to design an apparatus which will hit a marble a horizontal distance of from 1.5-1.6m every time. I have to calculate the force I need to hit the marble, but I can't seem to find an equation which works. If it helps any, the mass of the marble is 3.56g and I'm using a hammer which is held up on a swivel which swings down and strikes the marble. As well I have to calculate the average horizontal velocity. I am just not sure where to begin and what to do.