Feet on the Ground was created in 1984.
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Ten Feet off the Ground was created in 1968.
The ball which you drop from 5 feet will reach the ground first.
At Ground Zero was created in 1994.
The law that explains this interaction is Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. When you walk, your feet exert a force on the ground in the backward direction, and in response, the ground exerts an equal and opposite force on your feet in the forward direction. This interaction allows you to move forward by pushing against the ground.
Ground Beef