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If the falling parachutist has a downward force of 500 N, and the air resistance force is 900 N (negative), then the net force is:500 N - 900 N = -400 N So, the parachutist gets a net upward force, causing him to decelerate while continuing to move downward, due to gravity.
Just add the forces on the desk. Use a positive sign for one direction, a negative sign for the opposite direction.
300 N upward
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A force of 36.06 N, at 33.69 degrees up from East.
15N
Regardless of what its speed is, if the aircraft is not accelerating, then the net force on it is zero. Since the force of the engines is 40,000 N, there must be exactly 40,000 N of opposing force in the opposite direction. That's the air resistance.
4 N upward
4 N upward
The net force would be zero, which means the falling object would no longer be accelerating, and would be falling at terminal velocity, which is a constant velocity. Weight is a downward (negative) force and air resistance is an upward (positive) force. Fnet = weight + air resistance = -12N + 12N = 0N
The object experiences 20 newtons pulling it down due to gravity. But it also experiences 4 newtons air resistance pushing it up. 20 - 4= 16 newtons net downward force on the object.
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