A 78-kg test "dummy" crashes into a wall at 14 m/s and is brought to rest in 0.10 s What is the magnitude of the average force exerted by the wall on the “dummy”?

If there was no gravity then their would be no downword force on the football to have it return the the grownd, and if there was no friction (mainly air friction) then there would be no opposing force the stop the ball from moving through the air allowing the ball to travle ∞.

Answer ( slope);