Answer on Mechanics | Relativity Question for shahera
Hence, since the downward force (your mass x gravitational acceleration) causes a reaction force that is equal in magnitude and directly opposite in direction, the net force will be zero. Hence, by the manipulation of Newton's second law: net Force = mass x acceleration.
If the net force = 0, and mass is still your mass, acceleration has to be 0. If there is no acceleration when you are at rest (meaning, no change in momentum) it means that you remain at rest. Hence, no force is produced to lift you upward.
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