what's the difference between projectile motion and ballistics?

Projectile motion is what it sounds like--the motion of a projectile.

If there are no forces on the projectile other than a constant weight (which is a reasonable approximation in many cases), then its path will be a parabola--its horizontal position will be be proportional to time, and its vertical position will be a quadratic function of time, and therefore of horizontal position.

An example of a projectile with a non-parabolic path would be a ballistic missile--once it burns out and clears the atmosphere, it follows an elliptical path until it re-enters.

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hmm lets see well I guess (yes this is a guess ^_^) they are both similar because an object is accelerated and moves in space. Projectile motion would be motion given to something, but that object will decelerate eventually (like a bullet, it loses momentum). Linear motion might therefore be like a constant movement in a direction at a speed with no deceleration ( like a car maintaining its speed along a highway)

well ball-is-tic.. thats when a ball has a tick. get your man clean

and projectile motion is when a guy cums its projectiled out of his body.

your stupid