# Projectile motion formula for horizontal | Gravitation and Motion | meriSTEM

So what happens when our velocity is

zero? Well, this is the case where he dropped the treat straight onto the

floor. But what about when we throw the treats at an angle?

Well, we know that our horizontal and vertical axes are independent. So in the

virtual direction, it doesn’t matter what is happening in the horizontal direction,

because it won’t affect our article motion. Some may saying that we already

have the equations for a vertical motion, exactly, so if we label a vertical

direction our Y axis and real label our variables, then we have the equations of

motion in the vertical direction. However, if we want to understand our object’s

motion, then we still need the equations for a horizontal direction. We all labelled

this our x axis. As we’ve discussed, there are no horizontal forces. Therefore, we

immediately know that our horizontal acceleration is zero, and if our velocity

isn’t changing because our acceleration is zero, then the only possible velocity

in the horizontal direction is our initial velocity, and this has no

dependence on time. So a horizontal displacement is just equal to our

initial velocity times time, plus any initial horizontal displacement. As

previously, if we’re finding displacement from an initial position of zero, then

this term will be zero and our horizontal displacement will just be

equal to the initial horizontal velocity times time. We now have all the equations

that fully describe projectile motion.