When a football player kicks the ball it stayed at rest but when the football player kicked the ball it was in the air.With the force of the kick the ball is gonna end up flying.
Newtons Law 3
And the ball fly's high into the air...
As a teammate on the blue side one of them catches the football running to make a touchdown. As an opponent on the purple team ran towards the blue teams football player he was thrown half way across the field and the purple teammate only flew 4 feet backwards.
Both Quarterbacks on the purple and blue team were running against each other both 150 pounds at the same rate of 4 mph. With the same weight and speed they both are pushed against each-other and both flew back 2 feet.