Suppose you are standing on a skateboard and shoot a paintball gun at your friend. which direction relative to
your friend will you move? explain. _

I will move way from my friend.

Explanation:

As I shoot the paintball towards my friend, the gun exerts a force on it that sends it moving towards my friend, and according to newtons third law, the paintball exerts an equal and opposite force on me, which causes me to move in the opposite direction of the movement of the paintball; this direction is away from my friend.