Newton's first law of motion states that an object will remain at rest or in uniform motion until and unless an external force is applied. So, how we are able to move our hand in air form rest with our internal force?
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The First Law states, "A body at rest will remain at rest, and a body in motion will remain in motion unless it is acted upon by an external force." This simply means that things cannot start, stop or change direction all by themselves. It requires some force acting on them from the outside to cause such a change.
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