Answer:
Explanation:
is A projectile is any object on which the only force acting is gravity and air resistance (drag).
Examples of projectiles are:
baseballs and softballs in the air after being hit by the bat
golf balls hit by a club
objects dropped from aircraft, such as people (skydivers), bombs, crates of food being dropped to refugees
objects launched by cannons, such as cannonballs, shells, and circus performers
Once the baseball, softball, golf ball, skydiver, bomb, crate, cannonball, shell, or clown are no longer touching the bat, club, aircraft, or cannon, and are in the air with only gravity and slight air resistance acting on it, then it is a projectile.
Here is an online projectile motion applets to play with, just for fun.
Unless otherwise stated in a particular problem or discussion, we will be ignoring the effects of air resistance.
The key to understanding the motion of projectiles is that the horizontal motion and the vertical motion of the projectile are independent of each other. So we can write separate equations for the displacement of the projectile in the horizontal (x) and vertical (y) directions.
The only common variable between these two equations is t, the time. Because in projectile problems there is usually no acceleration (i.e. we ignore air resistance) in the horizontal direction, we can write
The velocity components follow the same equations we used for one-dimensional motion.
Because there is usually no acceleration in the x direction, the x-velocity is constant.
, with 
being the elementary charge, and 
and 
are the initial and final voltage.
