If an object is simply dropped and then allowed to reach its terminal velocity, what is the net force acting on the object?
When the object is first dropped( take example of a metal ball dropped in a liquid) it first accelerates and increases its velocity, the drag force which opposes the motion is a function of velocity so as the velocity continues to increase the drag force continues to increase as well, in due course of motion the net force on the body ( Weight - Drag Force ) keeps decreasing and eventually becomes zero when a constant terminal velocity is attained.
Moreover, since the terminal velocity is a constant velocity so one can also say that,
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