Human reaction time is usually about 0.20 s. If your lab partner holds a ruler between your finger and thumb and releases it without warning,
how far can you expect the ruler to fall before you catch it? (Disregard air
resistance. g = 9.81 m/s2.)

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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 ∞.