The level of force needed to lift the bag from ground must equal to the amount of force required to counteract gravity.
What is a Force?
A Force refers to any influence that have the ability to change the motion of an object or cause an object with mass to change its velocity,
Hence, an opposite force towards where the bag is rested is needed to counteract the gravity forcing the bad downward.
Therefore, the level of force needed to lift the bag from ground must equal to the amount of force required to counteract gravity.
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