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Before we can model motion we need to define the quantities that we are going to use, once that has been done we can investigate how they are related.
Displacement as a vector, adding perpendicular displacements using pythagorus
What is the difference between velocity and speed?
When do we use instantaneous velocity and average velocity?
In an attempt to simplify we can consider all bodies to be a like a small ball with forces acting at the centre. Alternatively we could just consider the case of a small ball and ignore all other possibilities.
Not very nice to shoot monkeys but it makes a good point about the vertical component of projectile motion so it´s for a good cause.
Best to think of projectile motion as two problems in one, constant velocity horizontally and constant acceleration ver