Okay well that's going to be a couple of vectors, so my first vector when I hit the ball is 30 meters per second and we'll say in the x direction okay. And I want to know what was that final velocity when that ball hit the ground. After I hit it, it takes 4 seconds to hit the ground below the cliff. Let's say I'm on a cliff and I've got a golf ball and I'm going to hit it in a horizontal direction 30 meters per second. So let's look at a problem you might get with projectile motion where we have an object moving in a horizontal velocity and also under the influence of gravity pulling it down. So that's how we can calculate the velocity at given time after an object is released and whether it's moving horizontally or dropping straight, that vertical velocity will always be the same. And just to review the velocity of a falling object under the force of gravity is equal to 9.8 meters per second squared times time. So projectile motion is any motion of an object moving through air or space and when an object is moving through air and space there's 2 forces working there, there's one the initial horizontal velocity and then there is the force of gravity which is always pulling it down to center of earth.
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