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The vertical and horizontal motion of a projectile are…
Completely independent
What happens if you drop a ball from a desk with no horizontal velocity and drop a ball from a desk with horizontal velocity?
Both objects hit the ground at the same time. The ball experiences a constant acceleration in the vertical plane. The horizontal component of the speed remains unchanged.
When a projectile is flying, what forces act on it?
Only weight, acting downwards
What happens to the vertical velocity during projectile motion?
The vertical velocity will first decrease until it reaches zero at maximum height. Then it will increase again until the particle strikes the ground